5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433

General

Target

5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe
Size

22KB
MD5

0e4f2f9c303c1988cb4a575896c2f9ca
SHA1

d45890164bd1b440828d369ae110d0c0545c6378
SHA256

5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433
SHA512

30170e76617fa7236c4f5219f14a3d75c37cba51124f07c73248edbe7f46893111d9e14716385f35b82e72e26b75098809f5d5a35793aa59c942f9ea1978af76
SSDEEP

384:jIz4Wd82EMVCGW8oSukbLpe2KKMOHbQVJv79tlDvz+ioL9+3w/0nIqeObSUrH:jIUWqeC/juNK4QPv71sL83w/0nIqeOj7

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

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\{47534147-4d48-4351-4753-41474D484351}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47534147-4d48-4351-4753-41474D484351}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47534147-4d48-4351-4753-41474D484351}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47534147-4d48-4351-4753-41474D484351}\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
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
1448	rmass.exe
1164	rmass.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x0006000000023270-2.dat	upx
behavioral2/memory/1448-5-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/1164-15-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/1448-49-0x0000000000400000-0x0000000000411000-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
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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\Startup = "Startup"	rmass.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\rmass.exe	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.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\aset32.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.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 created	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.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
1448	rmass.exe
1448	rmass.exe
1448	rmass.exe
1448	rmass.exe
1448	rmass.exe
1448	rmass.exe
1164	rmass.exe
1164	rmass.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1448	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2300 wrote to memory of 1448	2300	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe	81
PID 2300 wrote to memory of 1448	2300	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe	81
PID 2300 wrote to memory of 1448	2300	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe	81
PID 1448 wrote to memory of 616	1448	rmass.exe	5
PID 1448 wrote to memory of 3460	1448	rmass.exe	56
PID 1448 wrote to memory of 1164	1448	rmass.exe	82
PID 1448 wrote to memory of 1164	1448	rmass.exe	82
PID 1448 wrote to memory of 1164	1448	rmass.exe	82

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3460
- C:\Users\Admin\AppData\Local\Temp\5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe
  "C:\Users\Admin\AppData\Local\Temp\5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:2300
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\SysWOW64\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:1448
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:1164

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
22KB

MD5
61dad0d84b4f15434c7b7bb3002d8e2f

SHA1
9782949ba3bb09f5c91b60904782e0fbd8b56b87

SHA256
47cfda31e67417d5b211724bc8df8c3e27de73d6055511d9428294171cebc98c

SHA512
9e8c38e7fcdcf66c6ad8898164b9e2114178102705be0b504ca2117e39d3731756e04f0bc59f62740f4f874de2a225ef8b745c14cae1f88181cf83ef5565aa9e

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

Filesize
23KB

MD5
fad8945cda2dc408318b1c816090ed47

SHA1
b07f2f5d15be94c8d3fdde6e1e6a011e6ba6e1ff

SHA256
a2ec17e49952cc58fbca272cb065e8cfc83b02d0aada4842480428634d1f5418

SHA512
2acd57c38fcd49c6bbd4825dce8d72c6e0feac4886823a6833df22f2b23de59ee24e4f1ae83ccf65c2bbf7339c98576c12ec15e7ad108ebfc14198a5c4d519da

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

Filesize
20KB

MD5
f1113646a6a356a81b960aa6c8b4239f

SHA1
e3a7784b0179f07da5c8c8ce1e019b6bb105e3fd

SHA256
6025173244f04ea84d7d7c2666787457668e744c46531abfd323575fc7d66e37

SHA512
d6540c6a2cd5651e416c377f0fb7f3a10965619a767e8c7c166f9837dc17090e8349e796b7041aaa22d32d956a173c84dfbf25e6dc1e951c62e1f59afcf61271

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/1164-15-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1448-5-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1448-49-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2300-3-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads