MVISION Insights: The Evolution Of The FIN7 JSSLoader
Technical Articles ID:
KB94907
Last Modified: 9/22/2021
Last Modified: 9/22/2021
Environment
IMPORTANT: This Knowledge Base article discusses a specific threat that is being automatically tracked by MVISION Insights technology. The content is intended for use by MVISION Insights users, but is provided for general knowledge to all McAfee Enterprise customers. Contact McAfee Enterprise for more information about MVISION Insights.
Summary
The Anunak (FIN7) group has been active since 2014. Over the years, they have revised their modus operandi and upgraded their arsenal. In December 2020, a detailed report was published of FIN7's use of the JSSLoader, which is a type of .NET trojan. This piece of malware is not that extensive, but it offers exfiltration and persistence capabilities and has the ability to auto-update and download more malware. The McAfee Enterprise ATR Team gathers and analyzes information from multiple open and closed sources before disseminating intelligence reports. This campaign was researched by Morphisec and shared publicly .
How to use this article:
- If a Threat Hunting table has been created, use the rules contained to search for malware related to this campaign.
- Review the product detection table and confirm that your environment is at least on the specified content version.
To download the latest content versions, go to the Security Updates page.
- Scroll down and review the "Product Countermeasures" section of this article. Consider implementing them if they are not already in place.
- Review
KB91836 - Countermeasures for entry vector threats, which contains countermeasures . - Review KB87843 - List of and best practices for Endpoint Security Dynamic Application Containment rules.
- Review KB82925 - Identify what rule corresponds to an Adaptive Threat Protection and Threat Intelligence Exchange event.
This Knowledge Base article discusses a specific threat that is being tracked. The list of IOCs will change over time; check MVISION Insights for the latest IOCs.
Campaign IOC
| Type | Value |
Minimum Content Versions:
| Content Type | Version |
| V2 DAT (VirusScan Enterprise) | 10016 |
| V3 DAT (Endpoint Security) | 4468 |
Detection Summary
| IOC | Scanner | Detection |
| 793AA21ED7432EF2B0EDA8D80036361878F728DBC4081D72F80FA3694702A4D8 | AVEngine V2 | Agent-FMR!05563D9FA369 |
| AVEngine V3 | Agent-FMR!05563D9FA369 | |
| JTI (ATP Rules) | JTI/Suspect.196612!05563d9fa369 | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 55E29AD1D04AF6FD59592825681438F2BA262751DE14D64D9CF41C89D8AD6294 | AVEngine V2 | VBS/Agent.ga |
| AVEngine V3 | VBS/Agent.ga | |
| JTI (ATP Rules) | - | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| C328F48C5F4A2C2441BCD0B0C0551547CA254F7EBBB46D30D357E962D8330063 | AVEngine V2 | Agent.nb |
| AVEngine V3 | Agent.nb | |
| JTI (ATP Rules) | JTI/Suspect.196612!122cb55f1352 | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| D2B080B9AF5D39D72AF149AFB065E769B1DA8005EDFE84237942A1B99F4FA36C | AVEngine V2 | Agent-FMR!17EA1D7A6A31 |
| AVEngine V3 | Agent-FMR!17EA1D7A6A31 | |
| JTI (ATP Rules) | JTI/Suspect.196612!17ea1d7a6a31 | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| DB1D98E9CCA11BEEA4CFD1BFBE097DFFD9FC4CC8B1B02E781863658D8C6F16C7 | AVEngine V2 | Agent-FMR!187D83DCB8E7 |
| AVEngine V3 | Agent-FMR!187D83DCB8E7 | |
| JTI (ATP Rules) | JTI/Suspect.196612!187d83dcb8e7 | |
| RP Static | Real Protect-PEE!187D83DCB8E7 | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| A0C5B1FDCB95037E57DD502D848AA3137882D7AF6FBF301262E8CD35DB7F58B7 | AVEngine V2 | Agent-FMR!1C573BB8ECBF |
| AVEngine V3 | Agent-FMR!1C573BB8ECBF | |
| JTI (ATP Rules) | JTI/Suspect.196612!1c573bb8ecbf | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 2DF508247A4E739B086C9DE47D91A26EA7AEE4D5CF9BC5CC70B5AD2DC7F102C6 | AVEngine V2 | Agent-FMR!1E6BC9562395 |
| AVEngine V3 | Agent-FMR!1E6BC9562395 | |
| JTI (ATP Rules) | JTI/Suspect.196612!1e6bc9562395 | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 2E3BC3B059733B4DB846D3227ABBFA6A7914B551F0175D6F77E22D08B57D49E3 | AVEngine V2 | Agent-FMR!347DA4760029 |
| AVEngine V3 | Agent-FMR!347DA4760029 | |
| JTI (ATP Rules) | JTI/Suspect.196612!347da4760029 | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 16F9674EA7C40A0E474966F59C413518509E295608C7ECC37C6096B034B88918 | AVEngine V2 | Agent-FMR!3BE25AB09FE2 |
| AVEngine V3 | Agent-FMR!3BE25AB09FE2 | |
| JTI (ATP Rules) | JTI/Suspect.196612!3be25ab09fe2 | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 967882624BA26C4FCD6806791AA4994B5BF64CA4B1E66DD8D24F1FA54B3A43F0 | AVEngine V2 | Agent-FMR!51DB6352DA13 |
| AVEngine V3 | Agent-FMR!51DB6352DA13 | |
| JTI (ATP Rules) | JTI/Suspect.196612!51db6352da13 | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| DABA93CF353585A67ED893625755077A2D351BA46EC5EA86B5BD0B45B84BC7C5 | AVEngine V2 | Agent-FMR!602502641978 |
| AVEngine V3 | Agent-FMR!602502641978 | |
| JTI (ATP Rules) | JTI/Suspect.196612!602502641978 | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| E6D239A37A39B8051E40949FA4647EFA6DD990A3AFE27E381F1E1EEA17D6B17B | AVEngine V2 | VBS/Agent.ga |
| AVEngine V3 | VBS/Agent.ga | |
| JTI (ATP Rules) | - | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 49895428F1A30131308022DD3AA56EAB6A1AA49B08A978EBC1520E289D3D6744 | AVEngine V2 | VBS/Agent.ga |
| AVEngine V3 | VBS/Agent.ga | |
| JTI (ATP Rules) | - | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 3D7199F569A31D3826AFD04A2F7D4DD2F692C9731FDF8CDFC8C7E03626BFFDAF | AVEngine V2 | PS/Agent.dg |
| AVEngine V3 | PS/Agent.dg | |
| JTI (ATP Rules) | - | |
| RP Static | Real Protect-PSL!70EA5E431E8E | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| A062A71A6268AF048E474C80133F84494D06A34573C491725599FE62B25BE044 | AVEngine V2 | Agent-FMR!7E36870FA5D1 |
| AVEngine V3 | Agent-FMR!7E36870FA5D1 | |
| JTI (ATP Rules) | JTI/Suspect.196612!7e36870fa5d1 | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 969CFEDDC1C90D36478F636EE31326E8F381518E725F88662CC28DA439038001 | AVEngine V2 | Agent-FMR!8052C7FA20ED |
| AVEngine V3 | Agent-FMR!8052C7FA20ED | |
| JTI (ATP Rules) | JTI/Suspect.196612!8052c7fa20ed | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 15F15B643EAFCC50777BED33EDA25158C7F58F4DBAAAA511072EF913A302A8DA | AVEngine V2 | Agent-FMR!98552CCFE01A |
| AVEngine V3 | Agent-FMR!98552CCFE01A | |
| JTI (ATP Rules) | JTI/Suspect.196612!98552ccfe01a | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 148D74E453E49BC21169B7CCA683E5764D0F02941B705AAA147977FFD1501376 | AVEngine V2 | RDN/Generic PWS.y |
| AVEngine V3 | RDN/Generic PWS.y | |
| JTI (ATP Rules) | JTI/Suspect.196612!a3892280be01 | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 8279CE0EB52A9F5B5AB02322D1BB7CC9CB5B242B7359C3D4D754687069FCB7B8 | AVEngine V2 | VBS/Downloader.zc |
| AVEngine V3 | VBS/Downloader.zc | |
| JTI (ATP Rules) | - | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| C1E7D6EC47169FFB1118C4BE5ECB492CD1EA34F3F3DD124500D337AF3E980436 | AVEngine V2 | Agent.ne |
| AVEngine V3 | Agent.ne | |
| JTI (ATP Rules) | JTI/Suspect.196612!a843c7018c53 | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 98FE1D06E4C67A5A5666DD01D11E7342AFC6F1C7B007C2DDBFC13779BCC51317 | AVEngine V2 | GenericRXKF-PM!BF23C48D111F |
| AVEngine V3 | GenericRXKF-PM!BF23C48D111F | |
| JTI (ATP Rules) | JTI/Suspect.196612!bf23c48d111f | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 6A75254B45320109090FD775DCB78EC4E3DBCF325C3916253B5D6E105B92BE66 | AVEngine V2 | VBS/Agent.ga |
| AVEngine V3 | VBS/Agent.ga | |
| JTI (ATP Rules) | - | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 263B665A2CF660DC6B9F641E0ED5BF28023B81B6D1B48FC849AAE57B02528E7E | AVEngine V2 | PS/Agent.dj |
| AVEngine V3 | PS/Agent.dj | |
| JTI (ATP Rules) | - | |
| RP Static | Real Protect-PSCR!C9AA782F638F | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 33B3A1DA684EFC2891668EECF883BA7B9768A117956786E4356A27D1DFFE0560 | AVEngine V2 | RDN/Generic PWS.y |
| AVEngine V3 | RDN/Generic PWS.y | |
| JTI (ATP Rules) | JTI/Suspect.196612!d80feb14c5be | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 6F9A4E87DB50896FB4F54EA3E85F015BAC383FAF0E3DB0F5B20C462F322E946A | AVEngine V2 | VBS/Agent.ga |
| AVEngine V3 | VBS/Agent.ga | |
| JTI (ATP Rules) | - | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| C2E6F2496AB549C258A1D004FB0C5548413C81F5A556611C369D93A75E3835BE | AVEngine V2 | PS/Agent.dj |
| AVEngine V3 | PS/Agent.dj | |
| JTI (ATP Rules) | - | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 1F2AB2226F13BE64FEEECE1884EAA46E46C097BB79B703F7D622D8FF1A91B938 | AVEngine V2 | Agent-FMR!E0E19B748CBE |
| AVEngine V3 | Agent-FMR!E0E19B748CBE | |
| JTI (ATP Rules) | JTI/Suspect.196612!e0e19b748cbe | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 2373A6A7223154A2E4E3E84E4BDDA0D5A9BC22580CAF4F418DAE5637EFEC65E5 | AVEngine V2 | Agent-FMR!E9A432F52BA2 |
| AVEngine V3 | Agent-FMR!E9A432F52BA2 | |
| JTI (ATP Rules) | JTI/Suspect.196612!e9a432f52ba2 | |
| RP Static | - | |
| RP Dynamic | - |
| IOC | Scanner | Detection |
| 2180D0F46EC6F843FA8B1984ACFD251371BE7D4228D208EB22BC4A87E9B7C59F | AVEngine V2 | VBS/Downloader.zb |
| AVEngine V3 | VBS/Downloader.zb | |
| JTI (ATP Rules) | - | |
| RP Static | - | |
| RP Dynamic | - |
Minimum set of Manual Rules to improve protection to block this campaign
IMPORTANT: Always follow best practices when you enable new rules and signatures.
When you implement new rules or signatures, always set them to Report mode first and check the alerts generated. Resolve any issues that arise and then set the rules to Block. This step mitigates against triggering false positives and allows you to refine your configuration.
For more information, see KB87843 - List of and best practices for Endpoint Security Dynamic Application Containment rules.
Endpoint Security - Advanced Threat Protection:
Rule ID: 4 Use GTI file reputation to identify trusted or malicious files
Endpoint Security - Exploit Prevention:
Rule ID: 6135 Unmanaged Powershell Detected
Rule ID: 6086 Powershell Command Restriction - Command
Rule ID: 6127 Suspicious LSASS Access from Powershell
Rule ID: 6086 Powershell Command Restriction - Command
Rule ID: 6127 Suspicious LSASS Access from Powershell
Host Intrusion Prevention:
Rule ID: 6085 Powershell Command Restriction - File
Rule ID: 6082 Powershell Command Restriction - ExecutionPolicy Unrestricted
Rule ID: 6135 Unmanaged Powershell Detected
Rule ID: 6081 Powershell Command Restriction - NoProfile
Rule ID: 6082 Powershell Command Restriction - ExecutionPolicy Unrestricted
Rule ID: 6135 Unmanaged Powershell Detected
Rule ID: 6081 Powershell Command Restriction - NoProfile
Endpoint Security - Access Protection Custom Rules:
Rule: 1
Executables (Include):
powershell.exe
Subrules:
Subrule Type: Files
Operations:
create
Targets (Include):
?:\programdata\*\*.bin
powershell.exe
Subrules:
Subrule Type: Files
Operations:
create
Targets (Include):
?:\programdata\*\*.bin
Rule: 2
Executables (Include):
?script.exe
Subrules:
Subrule Type: Files
Operations:
create
Targets (Include):
?:\users\*\appdata\local\temp\*.exe
?script.exe
Subrules:
Subrule Type: Files
Operations:
create
Targets (Include):
?:\users\*\appdata\local\temp\*.exe
VirusScan Enterprise - Access Protection Custom Rules:
Rule: 1
Rule Type: File
Process to include: ?script.exe
File or folder name to block: *\users\*\appdata\local\temp\*.exe
File actions to prevent: Create
Process to include: ?script.exe
File or folder name to block: *\users\*\appdata\local\temp\*.exe
File actions to prevent: Create
Rule: 2
Rule Type: File
Process to include: powershell.exe
File or folder name to block: *\programdata\*\*.bin
File actions to prevent: Create
Process to include: powershell.exe
File or folder name to block: *\programdata\*\*.bin
File actions to prevent: Create
Aggressive set of Manual Rules to improve protection to block this campaign
IMPORTANT: Always follow best practices when you enable new rules and signatures.
When you implement new rules or signatures, always set them to Report mode first and check the alerts generated. Resolve any issues that arise and then set the rules to Block. This step mitigates against triggering false positives and allows you to refine your configuration.
For more information, see KB87843 - List of and best practices for Endpoint Security Dynamic Application Containment rules.
Virusscan Enterprise - Access Protection Rules:
Prevent creation of new executable files in the Windows folder
Prevent programs registering as a service
Prevent programs registering as a service
Host Intrusion Prevention:
Rule ID: 1003 Windows Agent Shielding - Process Access
Rule ID: 1148 CMD Tool Access by a Network Aware Application
Rule ID: 6010 Generic Application Hooking Protection
Rule ID: 6011 Generic Application Invocation Protection
Rule ID: 1020 Windows Agent Shielding - File Access
