arrowrat | 213452a323be1617cfa62abeae43d873bec1e5c740aa2177e157a9772a92f231

General

Target

ClientH.exe
Size

90KB
MD5

5558467d200c00a5acab51d4a9ca98dd
SHA1

f9d50c3556451b056deb0950b6bdd4c3ecbb570f
SHA256

213452a323be1617cfa62abeae43d873bec1e5c740aa2177e157a9772a92f231
SHA512

80167cbf7301726ef6a1fd8f2c91db4076f5f5c869338953b1dacc88bf7f82e7caadabbbf32ecda3327c1be4c9da2477a198123a9ac1acf114f03c64bada3921
SSDEEP

1536:ebRiQMhQ57SK3bUzZdQ1iIMvnZlbLxjV3AGq5gWlocT1wzySsd9NJ33p:ebRF57SKsstcnZTJQDgWPaySsdH5Z

Score

10^/10

arrowrat venomhvnc persistence rat

Malware Config

Extracted

Family

arrowrat

Botnet

VenomHVNC

C2

185.183.35.122:4448

Mutex

GHAEYKXuf.exe

Signatures

ArrowRat
Remote access tool with various capabilities first seen in late 2021.
rat arrowrat

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

ClientH.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1014134971-2480516131-292343513-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, C:\\Users\\Admin\\AppData\\Roaming\\PRtaDfZk\\PRtaDfZk"	ClientH.exe

Modifies Installed Components in the registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

explorer.exe

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1014134971-2480516131-292343513-1000\Software\Microsoft\Active Setup\Installed Components	explorer.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

ClientH.exe

description	pid	Process	procid_target
PID 2248 set thread context of 1624	2248	ClientH.exe	31

Modifies registry class 5 IoCs

Processes:

explorer.exe

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1014134971-2480516131-292343513-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1014134971-2480516131-292343513-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1014134971-2480516131-292343513-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1014134971-2480516131-292343513-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1014134971-2480516131-292343513-1000_Classes\Local Settings	explorer.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

ClientH.exe

pid	Process
2248	ClientH.exe

Suspicious use of AdjustPrivilegeToken 12 IoCs

Processes:

ClientH.exeexplorer.exe

description	pid	Process
Token: SeDebugPrivilege	2248	ClientH.exe
Token: SeShutdownPrivilege	2560	explorer.exe
Token: SeShutdownPrivilege	2560	explorer.exe
Token: SeShutdownPrivilege	2560	explorer.exe
Token: SeShutdownPrivilege	2560	explorer.exe
Token: SeShutdownPrivilege	2560	explorer.exe
Token: SeShutdownPrivilege	2560	explorer.exe
Token: SeShutdownPrivilege	2560	explorer.exe
Token: SeShutdownPrivilege	2560	explorer.exe
Token: SeShutdownPrivilege	2560	explorer.exe
Token: SeShutdownPrivilege	2560	explorer.exe
Token: SeShutdownPrivilege	2560	explorer.exe

Suspicious use of FindShellTrayWindow 27 IoCs

Processes:

explorer.exe

pid	Process
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe

Suspicious use of SendNotifyMessage 17 IoCs

Processes:

explorer.exe

pid	Process
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe
2560	explorer.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

ClientH.exeexplorer.exe

description	pid	Process	procid_target
PID 2248 wrote to memory of 2560	2248	ClientH.exe	30
PID 2248 wrote to memory of 2560	2248	ClientH.exe	30
PID 2248 wrote to memory of 2560	2248	ClientH.exe	30
PID 2248 wrote to memory of 2560	2248	ClientH.exe	30
PID 2560 wrote to memory of 780	2560	explorer.exe	32
PID 2560 wrote to memory of 780	2560	explorer.exe	32
PID 2560 wrote to memory of 780	2560	explorer.exe	32
PID 2248 wrote to memory of 1624	2248	ClientH.exe	31
PID 2248 wrote to memory of 1624	2248	ClientH.exe	31
PID 2248 wrote to memory of 1624	2248	ClientH.exe	31
PID 2248 wrote to memory of 1624	2248	ClientH.exe	31
PID 2248 wrote to memory of 1624	2248	ClientH.exe	31
PID 2248 wrote to memory of 1624	2248	ClientH.exe	31
PID 2248 wrote to memory of 1624	2248	ClientH.exe	31
PID 2248 wrote to memory of 1624	2248	ClientH.exe	31
PID 2248 wrote to memory of 1624	2248	ClientH.exe	31

C:\Users\Admin\AppData\Local\Temp\ClientH.exe
"C:\Users\Admin\AppData\Local\Temp\ClientH.exe"
1⤵
- Modifies WinLogon for persistence
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2248
- C:\Windows\explorer.exe
  "C:\Windows\explorer.exe"
  2⤵
  - Modifies Installed Components in the registry
  - Modifies registry class
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:2560
- - C:\Windows\system32\ctfmon.exe
    ctfmon.exe
    3⤵
    PID:780
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" VenomHVNC 185.183.35.122 4448 GHAEYKXuf.exe
  2⤵
  PID:1624

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1624-74-0x00000000011C0000-0x0000000001200000-memory.dmp

Filesize
256KB

Download
memory/1624-56-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/1624-70-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/1624-72-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/1624-60-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/1624-62-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/1624-64-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

Filesize
4KB

Download
memory/1624-66-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/1624-77-0x00000000011C0000-0x0000000001200000-memory.dmp

Filesize
256KB

Download
memory/1624-76-0x0000000073DA0000-0x000000007448E000-memory.dmp

Filesize
6.9MB

Download
memory/1624-58-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/1624-73-0x0000000073DA0000-0x000000007448E000-memory.dmp

Filesize
6.9MB

Download
memory/2248-54-0x0000000074490000-0x0000000074B7E000-memory.dmp

Filesize
6.9MB

Download
memory/2248-55-0x00000000012D0000-0x00000000012EC000-memory.dmp

Filesize
112KB

Download
memory/2248-69-0x0000000074490000-0x0000000074B7E000-memory.dmp

Filesize
6.9MB

Download
memory/2560-75-0x0000000003F30000-0x0000000003F31000-memory.dmp

Filesize
4KB

Download
memory/2560-82-0x00000000025F0000-0x0000000002600000-memory.dmp

Filesize
64KB

Download
memory/2560-78-0x0000000003F30000-0x0000000003F31000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads