3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5

General

Target

3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe
Size

64KB
MD5

999894655756b1877025b41ae9dcaad6
SHA1

5a77ce06bd0c9bee9778a329ce15137200e66ca6
SHA256

3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5
SHA512

8190a396d239494b4217c522c9e2c29f33f1e431cb04b8b7b2a5eb4e113b6b44776a37bea867708eef9eb36b2c109f65318a1a7c02e877adac61acdb9ba98842
SSDEEP

768:vAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGKQLddOW/24WvgMb7r3z:YUNHFKQbIkHvGMdOp4Zu7P

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\{55485251-4b4a-4350-5548-52514B4A4350}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{55485251-4b4a-4350-5548-52514B4A4350}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{55485251-4b4a-4350-5548-52514B4A4350}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{55485251-4b4a-4350-5548-52514B4A4350}\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
2300	rmass.exe
2632	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2456	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe
2456	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe
2300	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2456-0-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/2456-5-0x0000000000330000-0x0000000000342000-memory.dmp	upx
behavioral1/files/0x000a0000000120fa-4.dat	upx
behavioral1/memory/2456-12-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/2300-13-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/2300-80-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/2632-97-0x0000000000400000-0x0000000000412000-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\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

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\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.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\aset32.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\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe
File created	C:\Windows\SysWOW64\rmass.exe	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.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 4 IoCs

pid	Process
2300	rmass.exe
2300	rmass.exe
2300	rmass.exe
2632	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2456	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe
Token: SeDebugPrivilege	2300	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2456 wrote to memory of 2300	2456	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe	28
PID 2456 wrote to memory of 2300	2456	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe	28
PID 2456 wrote to memory of 2300	2456	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe	28
PID 2456 wrote to memory of 2300	2456	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe	28
PID 2300 wrote to memory of 432	2300	rmass.exe	5
PID 2300 wrote to memory of 1196	2300	rmass.exe	21
PID 2300 wrote to memory of 2632	2300	rmass.exe	29
PID 2300 wrote to memory of 2632	2300	rmass.exe	29
PID 2300 wrote to memory of 2632	2300	rmass.exe	29
PID 2300 wrote to memory of 2632	2300	rmass.exe	29

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:432

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1196
- C:\Users\Admin\AppData\Local\Temp\3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe
  "C:\Users\Admin\AppData\Local\Temp\3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2456
- - 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
    - Loads dropped DLL
    - 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:2300
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2632

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
66KB

MD5
a2f8d511e49a115e646ef82cbb52f510

SHA1
0f1feca593d0701011180287c13512e3444765fe

SHA256
ec6a1d9128528d78902207f76401d2f2a50700a843e26a51ee9a4677d24744e0

SHA512
37fb3960c6595c439910ca2fc6dbd873347e39e92a5fbb128d1412f7b33336a33ebb06eff1937de25c72a70c691282299ed44d5538cbd890a3d466f65567ba96

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

Filesize
67KB

MD5
6aaf0d05492de8c28cf15d294fe309e6

SHA1
cb83f122842c8a6cefc12a8922798ae1416b311d

SHA256
2976fe79a3a1a948f00242d6c8ec14b4620d018e03bfe1818496bd4a861a8d8b

SHA512
11de4187d69a00b70dc82e769324fd7060aae71e6d20d524d2bc41bab2ecd4426a58af66444863f0e414672e6ebb009c7d28e75b003460f313a32f9bcf9e7a94

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

Filesize
1KB

MD5
b10b13206b0f2cf3968050072f6979bf

SHA1
699db21ba9cecf3f13ac3d76e22cfa41aa94da80

SHA256
0eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4

SHA512
d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
64KB

MD5
999894655756b1877025b41ae9dcaad6

SHA1
5a77ce06bd0c9bee9778a329ce15137200e66ca6

SHA256
3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5

SHA512
8190a396d239494b4217c522c9e2c29f33f1e431cb04b8b7b2a5eb4e113b6b44776a37bea867708eef9eb36b2c109f65318a1a7c02e877adac61acdb9ba98842

Download Submit
memory/2300-80-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2300-24-0x0000000000420000-0x0000000000432000-memory.dmp

Filesize
72KB

Download
memory/2300-13-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2300-87-0x0000000000420000-0x0000000000432000-memory.dmp

Filesize
72KB

Download
memory/2456-12-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2456-0-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2456-5-0x0000000000330000-0x0000000000342000-memory.dmp

Filesize
72KB

Download
memory/2632-97-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads