26f8835f0ba1c284cb5e7b7da21d27d0ee85b0f3005ff9970ecfa1c61347baac

General

Target

26f8835f0ba1c284cb5e7b7da21d27d0ee85b0f3005ff9970ecfa1c61347baac.exe
Size

21KB
MD5

3f9412bf7759af3a248c2a9f6160f27a
SHA1

f3167c6dedcf568db40a93286cdfbfece2f75817
SHA256

26f8835f0ba1c284cb5e7b7da21d27d0ee85b0f3005ff9970ecfa1c61347baac
SHA512

9037bf27734ae71f16687f114f55dcc48af4d125ef271239c149376db17a7fbac94c11816f881c2447a9568063cd3b5e126921dcade9573eadbe373cfc9c5217
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6MPgen:rRkiLw3HsDSARGG/MMb7rGb

Score

10^/10

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

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
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F424A49-5955-4945-4F42-4A4959554945}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F424A49-5955-4945-4F42-4A4959554945}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F424A49-5955-4945-4F42-4A4959554945}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F424A49-5955-4945-4F42-4A4959554945}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	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
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
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe	rmass.exe

Executes dropped EXE 2 IoCs

pid	Process
2840	rmass.exe
3316	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2280-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000d000000023383-5.dat	upx
behavioral2/memory/2280-6-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2840-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/3316-18-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2840-52-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/3316-53-0x0000000000400000-0x0000000000411000-memory.dmp	upx

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
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\rmass.exe	26f8835f0ba1c284cb5e7b7da21d27d0ee85b0f3005ff9970ecfa1c61347baac.exe
File created	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\winrnt.exe	rmass.exe
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	26f8835f0ba1c284cb5e7b7da21d27d0ee85b0f3005ff9970ecfa1c61347baac.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	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\rmass.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
2840	rmass.exe
2840	rmass.exe
2840	rmass.exe
2840	rmass.exe
2840	rmass.exe
2840	rmass.exe
3316	rmass.exe
3316	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2280	26f8835f0ba1c284cb5e7b7da21d27d0ee85b0f3005ff9970ecfa1c61347baac.exe
Token: SeDebugPrivilege	2840	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2280 wrote to memory of 2840	2280	26f8835f0ba1c284cb5e7b7da21d27d0ee85b0f3005ff9970ecfa1c61347baac.exe	84
PID 2280 wrote to memory of 2840	2280	26f8835f0ba1c284cb5e7b7da21d27d0ee85b0f3005ff9970ecfa1c61347baac.exe	84
PID 2280 wrote to memory of 2840	2280	26f8835f0ba1c284cb5e7b7da21d27d0ee85b0f3005ff9970ecfa1c61347baac.exe	84
PID 2840 wrote to memory of 608	2840	rmass.exe	5
PID 2840 wrote to memory of 3456	2840	rmass.exe	56
PID 2840 wrote to memory of 3316	2840	rmass.exe	85
PID 2840 wrote to memory of 3316	2840	rmass.exe	85
PID 2840 wrote to memory of 3316	2840	rmass.exe	85

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:608

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3456
- C:\Users\Admin\AppData\Local\Temp\26f8835f0ba1c284cb5e7b7da21d27d0ee85b0f3005ff9970ecfa1c61347baac.exe
  "C:\Users\Admin\AppData\Local\Temp\26f8835f0ba1c284cb5e7b7da21d27d0ee85b0f3005ff9970ecfa1c61347baac.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2280
- - 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:2840
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:3316

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

C:\Windows\SysWOW64\RECOVER32.DLL

Filesize
5KB

MD5
2b2c28a7a01f9584fe220ef84003427f

SHA1
5fc023df0b5064045eb8de7f2dbe26f07f6fec70

SHA256
9e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb

SHA512
39192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78

Download Submit
C:\Windows\SysWOW64\ahuy.exe

Filesize
23KB

MD5
55df6b4d21613dbeb166b3aa272963ad

SHA1
dc372ad7d8c50f116a0b56fb51340312fcdb247a

SHA256
8c92b19b81863028cbeb86c221bfd66c3729b480cbd970470d55ccffa0378889

SHA512
9f58996b30d2ea3731cb77e6ff9655dd5a4fb7327ccfff1ba09f689dcd6ea38fe4ed9ed69cbc8581fbb3e0dcc750aaaef6c69dc3f1db3219c05408f62d87d15f

Download Submit
C:\Windows\SysWOW64\ntdbg.exe

Filesize
24KB

MD5
8db97658d645163b6ea97716146ba54b

SHA1
609806236127877c761ae137e8fc7baac7d3ba55

SHA256
1d6f1e0da29b0de5adb6ed8ef06a3ee7704913a826cf71a30363e8592e4b0302

SHA512
34f48ba6ef0215b1cbaae38be13eddab07d7ef8452d9604d10c2c37d3a1a4e5328fe11c92a90f3532cb9e532b10dec1c3dba55a5d4b2d0bb115482906f52b8f1

Download Submit
C:\Windows\SysWOW64\rmass.exe

Filesize
21KB

MD5
3f9412bf7759af3a248c2a9f6160f27a

SHA1
f3167c6dedcf568db40a93286cdfbfece2f75817

SHA256
26f8835f0ba1c284cb5e7b7da21d27d0ee85b0f3005ff9970ecfa1c61347baac

SHA512
9037bf27734ae71f16687f114f55dcc48af4d125ef271239c149376db17a7fbac94c11816f881c2447a9568063cd3b5e126921dcade9573eadbe373cfc9c5217

Download Submit
C:\Windows\System32\drivers\etc\hosts

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/2280-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2280-6-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2840-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2840-52-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3316-18-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3316-53-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads