e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460

Analysis

max time kernel
150s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
02/11/2024, 16:45

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General

Target
e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460.exe
Size 22KB
Sample241102-t9mt7szerk
SHA256 e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460
MD5 5681141d71176d6109a9c9b0c8ed3710
SHA1 94dd6df6c8ae3c5207d844e39487438dadbef1c6
SHA512 004dd240514c7eabb2bc2899bfad82d4a7634a06ed7885d2338564ed9da719786d614e0fb3fbb0deb49436d7f9366b37cd0176ed36efe09a483783d301f43762
SSDEEP 384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6MVE:rRkiLw3HsDSARGG/MMb7rp
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

defense_evasion discovery evasion persistence trojan upx

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

Boot or Logon Autostart Execution: Active Setup 2 TTPs 4 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{48474E42-5742-4757-4847-4E4257424757}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{48474E42-5742-4757-4847-4E4257424757}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{48474E42-5742-4757-4847-4E4257424757}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{48474E42-5742-4757-4847-4E4257424757}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe

Drops file in Drivers directory 1 IoCs

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

Event Triggered Execution: Image File Execution Options Injection 1 TTPs 3 IoCs

persistence

Image File Execution Options Injection

T1546.012

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
1728	rmass.exe
3620	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

Indicator Removal: Clear Persistence 1 TTPs 1 IoCs

remove IFEO.

defense_evasion

Clear Persistence

T1070.009

description	ioc	Process
Delete value	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger	rmass.exe

Modifies WinLogon 2 TTPs 5 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
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
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

Drops file in System32 directory 12 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460.exe
File created	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File created	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/3368-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000a000000023c4f-5.dat	upx
behavioral2/memory/3368-7-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/1728-42-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/3620-47-0x0000000000400000-0x0000000000411000-memory.dmp	upx

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

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rmass.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rmass.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1728	rmass.exe
1728	rmass.exe
1728	rmass.exe
1728	rmass.exe
1728	rmass.exe
1728	rmass.exe
3620	rmass.exe
3620	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3368	e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460.exe
Token: SeDebugPrivilege	1728	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3368 wrote to memory of 1728	3368	e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460.exe	84
PID 3368 wrote to memory of 1728	3368	e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460.exe	84
PID 3368 wrote to memory of 1728	3368	e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460.exe	84
PID 1728 wrote to memory of 616	1728	rmass.exe	5
PID 1728 wrote to memory of 3588	1728	rmass.exe	56
PID 1728 wrote to memory of 3620	1728	rmass.exe	85
PID 1728 wrote to memory of 3620	1728	rmass.exe	85
PID 1728 wrote to memory of 3620	1728	rmass.exe	85

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:616

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3588
- C:\Users\Admin\AppData\Local\Temp\e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460.exe
  "C:\Users\Admin\AppData\Local\Temp\e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460.exe"
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3368
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\system32\rmass.exe"
    3⤵
    - Windows security bypass
    - Boot or Logon Autostart Execution: Active Setup
    - Drops file in Drivers directory
    - Event Triggered Execution: Image File Execution Options Injection
    - Executes dropped EXE
    - Windows security modification
    - Indicator Removal: Clear Persistence
    - Modifies WinLogon
    - Drops file in System32 directory
    - Drops file in Program Files directory
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1728
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:3620

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

Image File Execution Options Injection

T1546.012

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

Image File Execution Options Injection

T1546.012

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Indicator Removal

T1070

Clear Persistence

T1070.009

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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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 24KB
SHA256 6c14a3d94b0389d66583c00d51ce755a21fddd58f86a5af5c3303c57bc523b7d
MD5 ec0a3d1e378a8b1163c7bbb90423c75d
SHA1 8c7f5019eb767ad2eac4c86d825da51e2557cadd
SHA512 c93382095648de7e2e0fd5c3748a192bec0058a00c3ddddf1fb51439c74f2ffbea34c0849a3ab2274be88d334ddfa90230e9420afc166229cb27716f6f49a7dc
SSDEEP 384:jIz4BTILCxUJHJpP79Ejj5xEZBiz1BpPR6aHLaKH+dDrqVBo2+y1O4fh5:jIUBtxU3pPqjlxeBeTmKH+z0nf7
MD5 SHA1 SHA512 SSDEEP

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ntdbg.exe

Path C:\Windows\SysWOW64\ntdbg.exe
Size 25KB
SHA256 0da39802bf8335132810e1bfff6be5fb30ecef3d2ccfa76cf89b3a8a62ebac6f
MD5 cbb68491ec9d337f65bc554761060021
SHA1 a8b616fd004b127684da6ee4b54987c632463f85
SHA512 946b3bfa14ff30b2a9189935a080a2d09082a8ee3f43e67d35a30ed300094fd5950c48919340275bf5999db039d2d68a3aee04a5f7557437e68a38d59d265d8e
SSDEEP 384:ErzPZnmAXvK14dirr4tGjSz28MrHI0nTfSPt1rzMjkj8r6V+Orpc6WGIZbMR:ErzFXvKadiQi8MLdbAt1QO8reTc6M1MR
MD5 SHA1 SHA512 SSDEEP

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rmass.exe

Path C:\Windows\SysWOW64\rmass.exe
Size 22KB
SHA256 e85a835799a4bf06d2836a21de5b8c6f2db411498c19adb622393b8ea4aa0460
MD5 5681141d71176d6109a9c9b0c8ed3710
SHA1 94dd6df6c8ae3c5207d844e39487438dadbef1c6
SHA512 004dd240514c7eabb2bc2899bfad82d4a7634a06ed7885d2338564ed9da719786d614e0fb3fbb0deb49436d7f9366b37cd0176ed36efe09a483783d301f43762
SSDEEP 384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6MVE:rRkiLw3HsDSARGG/MMb7rp
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/1728-42-0x0000000000400000-0x0000000000411000-memory.dmp

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memory/3368-0-0x0000000000400000-0x0000000000411000-memory.dmp

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memory/3368-7-0x0000000000400000-0x0000000000411000-memory.dmp

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memory/3620-47-0x0000000000400000-0x0000000000411000-memory.dmp

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