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\{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
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

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
2540	rmass.exe
968	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1768-0-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/files/0x0009000000023547-5.dat	upx
behavioral2/memory/2540-11-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/968-18-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/1768-16-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/2540-52-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/968-53-0x0000000000400000-0x0000000000412000-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\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.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\ntdbg.exe	rmass.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\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe
File created	C:\Windows\SysWOW64\rmass.exe	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.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
2540	rmass.exe
2540	rmass.exe
2540	rmass.exe
2540	rmass.exe
2540	rmass.exe
2540	rmass.exe
968	rmass.exe
968	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1768	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe
Token: SeDebugPrivilege	2540	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1768 wrote to memory of 2540	1768	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe	90
PID 1768 wrote to memory of 2540	1768	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe	90
PID 1768 wrote to memory of 2540	1768	3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe	90
PID 2540 wrote to memory of 620	2540	rmass.exe	5
PID 2540 wrote to memory of 3476	2540	rmass.exe	56
PID 2540 wrote to memory of 968	2540	rmass.exe	91
PID 2540 wrote to memory of 968	2540	rmass.exe	91
PID 2540 wrote to memory of 968	2540	rmass.exe	91

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:620

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3476
- C:\Users\Admin\AppData\Local\Temp\3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe
  "C:\Users\Admin\AppData\Local\Temp\3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1768
- - 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:2540
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:968

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=3440,i,16710585221322798697,8586257254049248207,262144 --variations-seed-version --mojo-platform-channel-handle=4604 /prefetch:8
1⤵
PID:2216

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

Replay Monitor

Loading Replay Monitor...

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
7024895ff357427eb3062047b1cf1c3e

SHA1
7340e226f9842b690a1c786fd22aec4f44b5e038

SHA256
cbfcf4d3c74cdb08aa0736d9ff0efa0cff85bed6780c80706ccd61528b7f6b26

SHA512
d4f2781e02ed3e0c9cc17ec1138c1360e707bf6f9b167fbf97063bb9309eadff60e3bd49a9efa1c42a724d725aa73ff8b29e35069243125f4b80c9dd05d08668

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

Filesize
67KB

MD5
df42ecd408f418158393457814ee5f75

SHA1
178267bc9f79735a6bde2d7b51500599cdcbfa73

SHA256
9745c52158afbdf1854775b8c2f8b494b0c97b008b285d784d669abff505dceb

SHA512
27cbf299c9f1458eae7491da24122612fdfb2435afa7286d79b30bdecd7c5085cd53bcd954b9e78fc06d6fd068fbd06cba56aba9f17d00fcd3736d75409e6fd8

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

Filesize
64KB

MD5
999894655756b1877025b41ae9dcaad6

SHA1
5a77ce06bd0c9bee9778a329ce15137200e66ca6

SHA256
3f5f982b3de31f5a291b29d0426362afb7e59908f4fe4efcec05598c1ba679a5

SHA512
8190a396d239494b4217c522c9e2c29f33f1e431cb04b8b7b2a5eb4e113b6b44776a37bea867708eef9eb36b2c109f65318a1a7c02e877adac61acdb9ba98842

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/968-18-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/968-53-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1768-0-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1768-16-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2540-11-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2540-52-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads