a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3

General

Target
a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe
Size 45KB
Sample240604-bps7dagb5v
SHA256 a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3
MD5 7f480131bb7fe36b0fa59fe13e955a16
SHA1 25d88182d2c2f06aa92bf7af2c5b55f57bbd1970
SHA512 9effdf9abca09f659f2fc7567900d08ebb7bc0931feb76116e57a7cbfb1287f6402e69cc83ea82759095f598514b0e88782ee708024cab8a692260964b0c745d
SSDEEP 768:WAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGVAQvKMb7r6:RUNHFKQbIkHvGkAFu7e
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

evasion persistence trojan

Malware Config

Signatures

Windows security bypass 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "5120"	rmass.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	rmass.exe

Modifies Installed Components in the registry 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47594C51-574a-434e-4759-4C51574A434e}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47594C51-574a-434e-4759-4C51574A434e}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47594C51-574a-434e-4759-4C51574A434e}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47594C51-574a-434e-4759-4C51574A434e}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe

Sets file execution options in registry 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 = "a"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger = "C:\\Windows\\system32\\ntdbg.exe"	rmass.exe

Executes dropped EXE 2 IoCs

pid	Process
4868	rmass.exe
764	rmass.exe

Windows security modification 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "5120"	rmass.exe

Modifies WinLogon 2 TTPs 5 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345 = "a"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\DLLName = "C:\\Windows\\system32\\RECOVER32.DLL"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\Startup = "Startup"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}	rmass.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File created	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe
File created	C:\Windows\SysWOW64\rmass.exe	a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\aset32.exe	rmass.exe

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\System\winrnt.exe	rmass.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\aset32.exe	rmass.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\idbg32.exe	rmass.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4868	rmass.exe
4868	rmass.exe
4868	rmass.exe
4868	rmass.exe
4868	rmass.exe
4868	rmass.exe
764	rmass.exe
764	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4908	a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe
Token: SeDebugPrivilege	4868	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4908 wrote to memory of 4868	4908	a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe	90
PID 4908 wrote to memory of 4868	4908	a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe	90
PID 4908 wrote to memory of 4868	4908	a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe	90
PID 4868 wrote to memory of 764	4868	rmass.exe	91
PID 4868 wrote to memory of 764	4868	rmass.exe	91
PID 4868 wrote to memory of 764	4868	rmass.exe	91
PID 4868 wrote to memory of 624	4868	rmass.exe	5
PID 4868 wrote to memory of 3524	4868	rmass.exe	56

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:624

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3524
- C:\Users\Admin\AppData\Local\Temp\a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe
  "C:\Users\Admin\AppData\Local\Temp\a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4908
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\system32\rmass.exe"
    3⤵
    - Windows security bypass
    - Drops file in Drivers directory
    - Modifies Installed Components in the registry
    - Sets file execution options in registry
    - Executes dropped EXE
    - Windows security modification
    - Modifies WinLogon
    - Drops file in System32 directory
    - Drops file in Program Files directory
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4868
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:764

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4164,i,13281073920029625837,8253721632651544158,262144 --variations-seed-version --mojo-platform-channel-handle=4464 /prefetch:8
1⤵
PID:1552

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Impair Defenses

2

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

RECOVER32.DLL

Path C:\Windows\SysWOW64\RECOVER32.DLL
Size 5KB
SHA256 9e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb
MD5 2b2c28a7a01f9584fe220ef84003427f
SHA1 5fc023df0b5064045eb8de7f2dbe26f07f6fec70
SHA512 39192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78
SSDEEP 48:6CsrGV5e2/WJbm73k2vZcsrkqSq2cxc2G5ZwJOFl:SqV5Roa73kQ/kqqAD
MD5 SHA1 SHA512 SSDEEP

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ahuy.exe

Path C:\Windows\SysWOW64\ahuy.exe
Size 47KB
SHA256 68478d3697e2c31f406a7c41b67782bdc33dcea8e76f6879c5c8b7416ad84047
MD5 119e2a8f94de3b25b40ca9dae7ece70e
SHA1 8362f9013d93955851e91aa6e51762480ee311f8
SHA512 be61b4ea0913549c77f693723b63293b13a14ad921868868b4e7760f208fbd94b6f3b985863cfba3fed2fbd5a43458ce873e50192b1ccbfc0e9c70d4944a578e
SSDEEP 768:jIUydkJhv4YL3mAJ4NkJZuOvbSM4adYzio0Ba4X8G0Pzj75AlgfaZhXR3Nv+IfLR:jUWR4KJZV54HzibXua
MD5 SHA1 SHA512 SSDEEP

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ntdbg.exe

Path C:\Windows\SysWOW64\ntdbg.exe
Size 48KB
SHA256 7d26f627886ee4c2304aa86aa503fe9fcf5d2e069a877bf374061582c22aef22
MD5 fed0d992c6b4e158cf9223856eda9358
SHA1 ccac8e2e95ff6962fcfda21300738d16dc75746b
SHA512 f8798f5cfa5cfb1bda6556d2a5ec73092f82fb0e6b78cedc31136b780e8f58dc3d7b599e19fb9744cb672e033d3b913e4ea1bd2245ad561f64567495ff9a83d8
SSDEEP 768:Erzc82gClS3NGyCgkjdgDk2lALcTTIKk9efb1:EcfyCgkpwk2lAyTIKk9efb1
MD5 SHA1 SHA512 SSDEEP

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rmass.exe

Path C:\Windows\SysWOW64\rmass.exe
Size 45KB
SHA256 a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3
MD5 7f480131bb7fe36b0fa59fe13e955a16
SHA1 25d88182d2c2f06aa92bf7af2c5b55f57bbd1970
SHA512 9effdf9abca09f659f2fc7567900d08ebb7bc0931feb76116e57a7cbfb1287f6402e69cc83ea82759095f598514b0e88782ee708024cab8a692260964b0c745d
SSDEEP 768:WAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGVAQvKMb7r6:RUNHFKQbIkHvGkAFu7e
MD5 SHA1 SHA512 SSDEEP

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hosts

Path C:\Windows\System32\drivers\etc\hosts
Size 1KB
SHA256 15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4
MD5 6f47b62de25d1745e296a06b3f98ed19
SHA1 a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f
SHA512 dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7
MD5 SHA1 SHA512

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memory/764-50-0x0000000000400000-0x000000000040E000-memory.dmp

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memory/4868-49-0x0000000000400000-0x000000000040E000-memory.dmp

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memory/4908-6-0x0000000000400000-0x000000000040E000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads