arrowrat | f51fe3720ba2e618cc10e6045a948880f6ca2c802466684332bf744e526059e7

General

Target

Arhvn.exe
Size

90KB
MD5

65bac4256dde1c7d987afa8ef8e9a1c4
SHA1

222922b2ba2f43cfc2049ca578b256d486fcf956
SHA256

f51fe3720ba2e618cc10e6045a948880f6ca2c802466684332bf744e526059e7
SHA512

7d08d19af3eff1a3899a4d039ba273ead5267e075af32b9755cd61ad5349bf6e6c87cbf9cca92893da7c4acecb42d9867f447f2139384e5de86b235c77125d27
SSDEEP

1536:ubRiQMn57SK3bUzZdQ1iIMvnZlbLxjV3AGq5gWlocT1wzySsd9NJ33L:ubRA57SKsstcnZTJQDgWPaySsdH57

Score

10^/10

arrowrat arrowrat persistence rat

Malware Config

Extracted

Family

arrowrat

Botnet

ArrowRAT

C2

arhvn.duckdns.org:5555

Mutex

fKHUsQQAb.exe

Signatures

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

Modifies Installed Components in the registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3513876443-2771975297-1923446376-1000\Software\Microsoft\Active Setup\Installed Components	explorer.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3004 set thread context of 2044	3004	Arhvn.exe	29

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3513876443-2771975297-1923446376-1000_Classes\Local Settings	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-3513876443-2771975297-1923446376-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-3513876443-2771975297-1923446376-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3513876443-2771975297-1923446376-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3513876443-2771975297-1923446376-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff	explorer.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
3004	Arhvn.exe

Suspicious use of AdjustPrivilegeToken 12 IoCs

description	pid	Process
Token: SeDebugPrivilege	3004	Arhvn.exe
Token: SeShutdownPrivilege	3068	explorer.exe
Token: SeShutdownPrivilege	3068	explorer.exe
Token: SeShutdownPrivilege	3068	explorer.exe
Token: SeShutdownPrivilege	3068	explorer.exe
Token: SeShutdownPrivilege	3068	explorer.exe
Token: SeShutdownPrivilege	3068	explorer.exe
Token: SeShutdownPrivilege	3068	explorer.exe
Token: SeShutdownPrivilege	3068	explorer.exe
Token: SeShutdownPrivilege	3068	explorer.exe
Token: SeShutdownPrivilege	3068	explorer.exe
Token: SeShutdownPrivilege	3068	explorer.exe

Suspicious use of FindShellTrayWindow 27 IoCs

pid	Process
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe

Suspicious use of SendNotifyMessage 17 IoCs

pid	Process
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe
3068	explorer.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 3004 wrote to memory of 3068	3004	Arhvn.exe	28
PID 3004 wrote to memory of 3068	3004	Arhvn.exe	28
PID 3004 wrote to memory of 3068	3004	Arhvn.exe	28
PID 3004 wrote to memory of 3068	3004	Arhvn.exe	28
PID 3068 wrote to memory of 2212	3068	explorer.exe	30
PID 3068 wrote to memory of 2212	3068	explorer.exe	30
PID 3068 wrote to memory of 2212	3068	explorer.exe	30
PID 3004 wrote to memory of 2044	3004	Arhvn.exe	29
PID 3004 wrote to memory of 2044	3004	Arhvn.exe	29
PID 3004 wrote to memory of 2044	3004	Arhvn.exe	29
PID 3004 wrote to memory of 2044	3004	Arhvn.exe	29
PID 3004 wrote to memory of 2044	3004	Arhvn.exe	29
PID 3004 wrote to memory of 2044	3004	Arhvn.exe	29
PID 3004 wrote to memory of 2044	3004	Arhvn.exe	29
PID 3004 wrote to memory of 2044	3004	Arhvn.exe	29
PID 3004 wrote to memory of 2044	3004	Arhvn.exe	29

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Arhvn.exe
"C:\Users\Admin\AppData\Local\Temp\Arhvn.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3004
- 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:3068
- - C:\Windows\system32\ctfmon.exe
    ctfmon.exe
    3⤵
    PID:2212
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" ArrowRAT arhvn.duckdns.org 5555 fKHUsQQAb.exe
  2⤵
  PID:2044

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2044-17-0x0000000002060000-0x00000000020A0000-memory.dmp

Filesize
256KB

Download
memory/2044-2-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2044-13-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2044-15-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2044-4-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2044-6-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2044-8-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

Filesize
4KB

Download
memory/2044-10-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2044-20-0x0000000002060000-0x00000000020A0000-memory.dmp

Filesize
256KB

Download
memory/2044-19-0x00000000747D0000-0x0000000074EBE000-memory.dmp

Filesize
6.9MB

Download
memory/2044-3-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2044-16-0x00000000747D0000-0x0000000074EBE000-memory.dmp

Filesize
6.9MB

Download
memory/3004-0-0x0000000000F30000-0x0000000000F4C000-memory.dmp

Filesize
112KB

Download
memory/3004-1-0x0000000074850000-0x0000000074F3E000-memory.dmp

Filesize
6.9MB

Download
memory/3004-12-0x0000000074850000-0x0000000074F3E000-memory.dmp

Filesize
6.9MB

Download
memory/3068-18-0x0000000003E70000-0x0000000003E71000-memory.dmp

Filesize
4KB

Download
memory/3068-25-0x0000000002760000-0x0000000002770000-memory.dmp

Filesize
64KB

Download
memory/3068-21-0x0000000003E70000-0x0000000003E71000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads