asyncrat | 64127c3e92e08691e9b2ba7f7bc3513b98328ce514d645ae85565cb9563961bc

Analysis

max time kernel
139s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
02/12/2024, 20:13

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General

Target

DcRat.exe
Size

5.0MB
MD5

9a2706b014494988041a7cd721dc2e77
SHA1

5ca23535cb0abe9b1e5ca5466cf49323d62f1b78
SHA256

9fa9476e19afbc0b9a022a568fe765b793f4966e7e0e0910a2fd07a21a8d848d
SHA512

0c884f57267e478b131fe07b87ed41d6727fd678bd74c7e8b75de61f13f0365c185649453772cb7fefee96ddccb2d51b4d1a52edf551ea34faec1aa06ebbfdab
SSDEEP

98304:ya4YLGi2jelUpj0d7+k1pGlW5j6cZoEMHAh8qreWpOEnGFPHHLbqV:ynYrksv1p7ZZoEMgxtpORFHPA

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

31.220.90.137:8848

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
true
install_file
Desktop Window Manager.exe
install_folder
%Temp%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral4/files/0x0008000000023c32-13.dat	family_asyncrat

Checks computer location settings 2 TTPs 3 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	DesktopWindowManager.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	DcRat.exe

Executes dropped EXE 3 IoCs

pid	Process
4524	DcRat.exe
2596	DesktopWindowManager.exe
3064	Desktop Window Manager.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 2 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	DcRat.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4640	timeout.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000_Classes\Local Settings	DcRat.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

pid	Process
1976	schtasks.exe

Suspicious behavior: EnumeratesProcesses 53 IoCs

pid	Process
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
2596	DesktopWindowManager.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe
4524	DcRat.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2596	DesktopWindowManager.exe
Token: SeDebugPrivilege	4524	DcRat.exe
Token: SeDebugPrivilege	3064	Desktop Window Manager.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4524	DcRat.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4524	DcRat.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 3992 wrote to memory of 4712	3992	DcRat.exe	83
PID 3992 wrote to memory of 4712	3992	DcRat.exe	83
PID 3992 wrote to memory of 4712	3992	DcRat.exe	83
PID 4712 wrote to memory of 4524	4712	WScript.exe	84
PID 4712 wrote to memory of 4524	4712	WScript.exe	84
PID 4712 wrote to memory of 2596	4712	WScript.exe	85
PID 4712 wrote to memory of 2596	4712	WScript.exe	85
PID 2596 wrote to memory of 4904	2596	DesktopWindowManager.exe	87
PID 2596 wrote to memory of 4904	2596	DesktopWindowManager.exe	87
PID 2596 wrote to memory of 60	2596	DesktopWindowManager.exe	89
PID 2596 wrote to memory of 60	2596	DesktopWindowManager.exe	89
PID 60 wrote to memory of 4640	60	cmd.exe	91
PID 60 wrote to memory of 4640	60	cmd.exe	91
PID 4904 wrote to memory of 1976	4904	cmd.exe	92
PID 4904 wrote to memory of 1976	4904	cmd.exe	92
PID 60 wrote to memory of 3064	60	cmd.exe	94
PID 60 wrote to memory of 3064	60	cmd.exe	94

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\DcRat.exe
"C:\Users\Admin\AppData\Local\Temp\DcRat.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3992
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\RarSFX0\run.vbs"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4712
- - C:\Users\Admin\AppData\Local\Temp\RarSFX0\DcRat.exe
    "C:\Users\Admin\AppData\Local\Temp\RarSFX0\DcRat.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    PID:4524
- - C:\Users\Admin\AppData\Local\Temp\RarSFX0\DesktopWindowManager.exe
    "C:\Users\Admin\AppData\Local\Temp\RarSFX0\DesktopWindowManager.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2596
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Desktop Window Manager" /tr '"C:\Users\Admin\AppData\Local\Temp\Desktop Window Manager.exe"' & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4904
    - - C:\Windows\system32\schtasks.exe
        
        schtasks /create /f /sc onlogon /rl highest /tn "Desktop Window Manager" /tr '"C:\Users\Admin\AppData\Local\Temp\Desktop Window Manager.exe"'
        5⤵
        Scheduled Task/Job: Scheduled Task
        
        PID:1976
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBAF3.tmp.bat""
      4⤵
      Suspicious use of WriteProcessMemory
      PID:60
    - - C:\Windows\system32\timeout.exe
        
        timeout 3
        5⤵
        Delays execution with timeout.exe
        
        PID:4640
    - - C:\Users\Admin\AppData\Local\Temp\Desktop Window Manager.exe
        
        "C:\Users\Admin\AppData\Local\Temp\Desktop Window Manager.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:3064

C:\Windows\system32\wbem\WmiApSrv.exe
C:\Windows\system32\wbem\WmiApSrv.exe
1⤵
PID:3656

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\RarSFX0\DcRat.exe

Filesize
12.3MB

MD5
7fce411ea2b74f227489659113960b18

SHA1
543d95b74193a188fe273ce7b065aa177405beb5

SHA256
c73b1ffa39c5843b2ed951ac48350d1deb33db4057341f1dab1ee64ea1a62248

SHA512
42de7bc4a0b47e1053ff3ff52a3f887e56759f81cfa691996a533d769e80f98b3e8dcf869785fce801d9cc7a2bc3d675e2eb832b520846b053d6b07093be2678

Download Submit
C:\Users\Admin\AppData\Local\Temp\RarSFX0\DesktopWindowManager.exe

Filesize
48KB

MD5
a175ae25d7f7ed25d6707e87f42e017c

SHA1
532786d28fd7e39ea6de8a454ef58c13b9dcb00d

SHA256
b2b45e365957b4a7c9fbad9d269652e5f96f709dc7a0828fbc757d9339b44e82

SHA512
b5a7ef58afe4cca624e3b13327a3f10a2b44b47f757cbd521e34c5857ba02e502fc8c1732c2f0b9652f636ea34ad168d44a139dd1e7ac480db75848aefa0aae0

Download Submit
C:\Users\Admin\AppData\Local\Temp\RarSFX0\run.vbs

Filesize
288B

MD5
b1ddcdfe8cb8410ee62eac12e0825689

SHA1
0a755b1f8fd422aea80574161ca21d5506aa213d

SHA256
dac31763f9fd7e0c565d5aecbb6a142bb5e1c6a607b6c4d36f4932050765c0ef

SHA512
bca697ba83e99504f33b6df858f3ed395ccb7124df2b3212ae1237907be46ab7f773e53bab585d967a825e4c5baa07149559218cbc384378a8c70365e53c9910

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpBAF3.tmp.bat

Filesize
169B

MD5
4ca8a7a776fecc1ee55f6a8ec4f10587

SHA1
c06825abb83e319d49c5af1c60abda22e6b814c6

SHA256
365cf17f0f3afdd38554571d04402bef21d99c3fe0736aadc0d227f7aeb24b04

SHA512
ab5fbd02bcdf3b55032baec8c30284d349c5dfdafc84760e806da7f19f5fb9f6af57dae2ad93cbd1a7f5d10f3f1a8a150af21ad35de584d2dc195a3bfffd8c8f

Download Submit
memory/2596-14-0x0000000000010000-0x0000000000022000-memory.dmp

Filesize
72KB

Download
memory/4524-12-0x00007FFF76943000-0x00007FFF76945000-memory.dmp

Filesize
8KB

Download
memory/4524-15-0x000001F12D330000-0x000001F12DF7A000-memory.dmp

Filesize
12.3MB

Download
memory/4524-24-0x00007FFF76943000-0x00007FFF76945000-memory.dmp

Filesize
8KB

Download