33b0861cdcf92bf7479afabe1637a63b14b1a1a4593d2ea66f819ef2dfddee47

General

Target

33b0861cdcf92bf7479afabe1637a63b14b1a1a4593d2ea66f819ef2dfddee47.exe
Size

65KB
MD5

01146f7bef3f439afd4672c9f0698970
SHA1

4eb3ea77524aee99b0c6f2af346fdd5a343146a8
SHA256

33b0861cdcf92bf7479afabe1637a63b14b1a1a4593d2ea66f819ef2dfddee47
SHA512

b1b3f90ddca3d21791ea25abe654d6bc3b035215d07ed1e0fd4b54ef6f21fe0956a7b46996189c7d68b6212e6b8819eed25b56b8ea548dabd7dc117f3f28d5bb
SSDEEP

768:jIUihihFX+6TPPngdXnYSizpNyjdrJcGbYyQfbHEmn5fE9Z8Slv2a5YgVNXpk:jQ9YSiKBJcGVGh6Z8avLXK

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

Processes:

rmass.exe

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

Processes:

rmass.exe

description ioc process

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

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

Processes:

rmass.exe

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

Processes:

rmass.exe

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

Processes:

rmass.exermass.exe

pid process

4960 rmass.exe
1532 rmass.exe

pid	process
4960	rmass.exe
1532	rmass.exe

UPX packed file 4 IoCs

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

upx

Processes:

resource	yara_rule
C:\Windows\SysWOW64\rmass.exe	upx
behavioral2/memory/4960-5-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/1532-15-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/4960-49-0x0000000000400000-0x0000000000412000-memory.dmp	upx

Windows security modification 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

rmass.exe

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

Processes:

rmass.exe

description	ioc	process
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
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

Drops file in System32 directory 12 IoCs

Processes:

rmass.exe33b0861cdcf92bf7479afabe1637a63b14b1a1a4593d2ea66f819ef2dfddee47.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	33b0861cdcf92bf7479afabe1637a63b14b1a1a4593d2ea66f819ef2dfddee47.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	33b0861cdcf92bf7479afabe1637a63b14b1a1a4593d2ea66f819ef2dfddee47.exe
File opened for modification	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\aset32.exe	rmass.exe

Drops file in Program Files directory 3 IoCs

Processes:

rmass.exe

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

Processes:

rmass.exermass.exe

pid process

4960 rmass.exe
4960 rmass.exe
4960 rmass.exe
4960 rmass.exe
4960 rmass.exe
4960 rmass.exe
1532 rmass.exe
1532 rmass.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

rmass.exe

description pid process

Token: SeDebugPrivilege 4960 rmass.exe

pid	process
4960	rmass.exe
4960	rmass.exe
4960	rmass.exe
4960	rmass.exe
4960	rmass.exe
4960	rmass.exe
1532	rmass.exe
1532	rmass.exe

description	pid	process
Token: SeDebugPrivilege	4960	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

33b0861cdcf92bf7479afabe1637a63b14b1a1a4593d2ea66f819ef2dfddee47.exermass.exe

description	pid	process	target process
PID 3112 wrote to memory of 4960	3112	33b0861cdcf92bf7479afabe1637a63b14b1a1a4593d2ea66f819ef2dfddee47.exe	rmass.exe
PID 3112 wrote to memory of 4960	3112	33b0861cdcf92bf7479afabe1637a63b14b1a1a4593d2ea66f819ef2dfddee47.exe	rmass.exe
PID 3112 wrote to memory of 4960	3112	33b0861cdcf92bf7479afabe1637a63b14b1a1a4593d2ea66f819ef2dfddee47.exe	rmass.exe
PID 4960 wrote to memory of 624	4960	rmass.exe	winlogon.exe
PID 4960 wrote to memory of 3520	4960	rmass.exe	Explorer.EXE
PID 4960 wrote to memory of 1532	4960	rmass.exe	rmass.exe
PID 4960 wrote to memory of 1532	4960	rmass.exe	rmass.exe
PID 4960 wrote to memory of 1532	4960	rmass.exe	rmass.exe

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:624

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3520
- C:\Users\Admin\AppData\Local\Temp\33b0861cdcf92bf7479afabe1637a63b14b1a1a4593d2ea66f819ef2dfddee47.exe
  "C:\Users\Admin\AppData\Local\Temp\33b0861cdcf92bf7479afabe1637a63b14b1a1a4593d2ea66f819ef2dfddee47.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:3112
- - 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:4960
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:1532

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=4040,i,13035806169561352434,1332896185314862791,262144 --variations-seed-version --mojo-platform-channel-handle=4128 /prefetch:8
1⤵
PID:4548

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
65KB

MD5
163612f2469e5e0a4bd460e349eb921a

SHA1
e182626dda1790b2f3c00e574f3f8a0d138e0c4c

SHA256
23d36facce8e318a2587fca9b8561f86ca3b72965abeff41a38077d92f252c46

SHA512
96a178360cbf3b6916065d15662fe728bb8d9354661e6cad1562e8fec83ecdac9d98cbd1898c7d0fbc746eb7057b660a9ba505a5a42477d47237d6bbff65e85c

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

Filesize
66KB

MD5
f7ca9281e94eea6f8ac03072d9eedbcd

SHA1
b369ab40664e7559ddc90c6c507ffc2f88b0abe8

SHA256
caaf998efdf5385ff3770730001c4e20ebfe9ad7d87506e1f83556daa5f71364

SHA512
8817bd6a252405d57ea773a8af37248da16f9e02a219b22d41befab8e370fec4f297fe6bdd098cebf4fe828e21caebcd76cf30a639dcc69943b5101590315f74

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

Filesize
63KB

MD5
cc65d3958f847eef8ad84f11aa9fab76

SHA1
314b23b1d4d9dbbe7a6234f83ef7ef96d4205aad

SHA256
8c722c60787f0d473f6b11bb0d7ec0a1ae63853b5538e30d0c55ba0ce7650772

SHA512
f815969a115defa49f683fd3084e353d964b9aa066555b2ef1bbcef93e5ecd82957fa7c302fae9220d4c59f4e6989b68b304490bbb8a957b13d39122152e03a2

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/1532-15-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/3112-3-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download
memory/4960-5-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/4960-49-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads