arrowrat | a1923ce6f95ba7e57b9d8ea27c1867283cacbc992a0f9e16ec9dd864930d9d71

Analysis

max time kernel
149s
max time network
154s
platform
windows7_x64
resource
win7-20220901-en
resource tags

arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
submitted
07-12-2022 05:36

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General

Target

lib32.exe
Size

2.2MB
MD5

286de0123129cb1bdb0533301f435746
SHA1

28887e5a7c28661db7b3d4da3612bafd05604813
SHA256

a1923ce6f95ba7e57b9d8ea27c1867283cacbc992a0f9e16ec9dd864930d9d71
SHA512

07da8387eeffada23d39eed1390972e37031ea72a2f8a046027ac160f8ecef81ba3011698dac5fafc5114fe688796b1bc7c4df8a283dc1e23f76f0a2faf0b0bc
SSDEEP

49152:IhgaZCojYG3CmQYbfHxDJ6aiyc7jntoe:IhggwdY7d0tV

Score

10^/10

arrowrat client persistence rat

Malware Config

Extracted

Family

arrowrat

Botnet

Client

185.246.221.202:17168

Mutex

WcOErhAdu

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

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Active Setup\Installed Components	explorer.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\update = "\"C:\\Users\\Admin\\AppData\\Roaming\\Acrobat\\update.exe\""	lib32.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1448 set thread context of 584	1448	lib32.exe	29
PID 584 set thread context of 1832	584	lib32.exe	31

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Modifies registry class 5 IoCs

description	ioc	Process
Set value (data)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_Classes\Local Settings	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU	explorer.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
820	powershell.exe
584	lib32.exe
584	lib32.exe

Suspicious use of AdjustPrivilegeToken 18 IoCs

description	pid	Process
Token: SeDebugPrivilege	1448	lib32.exe
Token: SeDebugPrivilege	820	powershell.exe
Token: SeDebugPrivilege	584	lib32.exe
Token: SeShutdownPrivilege	1800	explorer.exe
Token: SeShutdownPrivilege	1800	explorer.exe
Token: SeShutdownPrivilege	1800	explorer.exe
Token: SeShutdownPrivilege	1800	explorer.exe
Token: SeShutdownPrivilege	1800	explorer.exe
Token: SeShutdownPrivilege	1800	explorer.exe
Token: SeShutdownPrivilege	1800	explorer.exe
Token: SeShutdownPrivilege	1800	explorer.exe
Token: 33	368	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	368	AUDIODG.EXE
Token: 33	368	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	368	AUDIODG.EXE
Token: SeShutdownPrivilege	1800	explorer.exe
Token: SeShutdownPrivilege	1800	explorer.exe
Token: SeShutdownPrivilege	1800	explorer.exe

Suspicious use of FindShellTrayWindow 23 IoCs

pid	Process
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe

Suspicious use of SendNotifyMessage 16 IoCs

pid	Process
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe
1800	explorer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
584	lib32.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 1448 wrote to memory of 820	1448	lib32.exe	27
PID 1448 wrote to memory of 820	1448	lib32.exe	27
PID 1448 wrote to memory of 820	1448	lib32.exe	27
PID 1448 wrote to memory of 820	1448	lib32.exe	27
PID 1448 wrote to memory of 584	1448	lib32.exe	29
PID 1448 wrote to memory of 584	1448	lib32.exe	29
PID 1448 wrote to memory of 584	1448	lib32.exe	29
PID 1448 wrote to memory of 584	1448	lib32.exe	29
PID 1448 wrote to memory of 584	1448	lib32.exe	29
PID 1448 wrote to memory of 584	1448	lib32.exe	29
PID 1448 wrote to memory of 584	1448	lib32.exe	29
PID 1448 wrote to memory of 584	1448	lib32.exe	29
PID 1448 wrote to memory of 584	1448	lib32.exe	29
PID 584 wrote to memory of 1800	584	lib32.exe	30
PID 584 wrote to memory of 1800	584	lib32.exe	30
PID 584 wrote to memory of 1800	584	lib32.exe	30
PID 584 wrote to memory of 1800	584	lib32.exe	30
PID 584 wrote to memory of 1832	584	lib32.exe	31
PID 584 wrote to memory of 1832	584	lib32.exe	31
PID 584 wrote to memory of 1832	584	lib32.exe	31
PID 584 wrote to memory of 1832	584	lib32.exe	31
PID 584 wrote to memory of 1832	584	lib32.exe	31
PID 584 wrote to memory of 1832	584	lib32.exe	31
PID 584 wrote to memory of 1832	584	lib32.exe	31
PID 584 wrote to memory of 1832	584	lib32.exe	31
PID 584 wrote to memory of 1832	584	lib32.exe	31
PID 1800 wrote to memory of 1668	1800	explorer.exe	33
PID 1800 wrote to memory of 1668	1800	explorer.exe	33
PID 1800 wrote to memory of 1668	1800	explorer.exe	33

C:\Users\Admin\AppData\Local\Temp\lib32.exe
"C:\Users\Admin\AppData\Local\Temp\lib32.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1448
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC UwB0AGEAcgB0AC0AUwBsAGUAZQBwACAALQBTAGUAYwBvAG4AZABzACAAMwAxAA==
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:820
- C:\Users\Admin\AppData\Local\Temp\lib32.exe
  C:\Users\Admin\AppData\Local\Temp\lib32.exe
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:584
- - C:\Windows\explorer.exe
    "C:\Windows\explorer.exe"
    3⤵
    - 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:1800
  - - C:\Windows\system32\ctfmon.exe
      ctfmon.exe
      4⤵
      PID:1668
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" Client 185.246.221.202 17168 WcOErhAdu
    3⤵
    PID:1832

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x564
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:368

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/584-62-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/584-70-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/584-72-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/584-66-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/584-67-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/584-64-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/584-61-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/820-60-0x000000006E700000-0x000000006ECAB000-memory.dmp

Filesize
5.7MB

Download
memory/820-59-0x000000006E700000-0x000000006ECAB000-memory.dmp

Filesize
5.7MB

Download
memory/820-58-0x000000006E700000-0x000000006ECAB000-memory.dmp

Filesize
5.7MB

Download
memory/820-57-0x00000000758B1000-0x00000000758B3000-memory.dmp

Filesize
8KB

Download
memory/1448-55-0x0000000004B70000-0x0000000004D9E000-memory.dmp

Filesize
2.2MB

Download
memory/1448-54-0x0000000001130000-0x0000000001368000-memory.dmp

Filesize
2.2MB

Download
memory/1800-75-0x000007FEFB9E1000-0x000007FEFB9E3000-memory.dmp

Filesize
8KB

Download
memory/1832-76-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/1832-79-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/1832-80-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/1832-81-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/1832-77-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/1832-85-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/1832-87-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download