asyncrat | 64127c3e92e08691e9b2ba7f7bc3513b98328ce514d645ae85565cb9563961bc

Analysis

max time kernel
132s
max time network
150s
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

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

DcRat.zip
Size

6.3MB
MD5

6b5246ddc575e3f7ca0242ba81910425
SHA1

5ad6cf004ed9137bb83ebdb8ae2ec20470446d1c
SHA256

64127c3e92e08691e9b2ba7f7bc3513b98328ce514d645ae85565cb9563961bc
SHA512

45790518c7c0e8af10fe95ce64d5f825b2f055164fd696fb28c5dede450f5aa42cc4df77d425aca274367e7b6ba244d361df2b7d50e3b1846361639c1cd90995
SSDEEP

98304:ylcQo9b/QZjeMrTgWilAwhySLYTfU8MGcgK80jWvzQvtHKvUOO89NSuRM:yv3Zj3TQlAdIYTfU8MGcHQUVKse9PRM

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
behavioral1/files/0x0007000000023cdc-21.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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	DcRat.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	DesktopWindowManager.exe

Executes dropped EXE 4 IoCs

pid	Process
4636	DcRat.exe
1708	DcRat.exe
116	DesktopWindowManager.exe
4528	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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DcRat.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2028	timeout.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_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
3672	schtasks.exe

Suspicious behavior: EnumeratesProcesses 58 IoCs

pid	Process
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
116	DesktopWindowManager.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
1708	DcRat.exe
2680	7zFM.exe
2680	7zFM.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2680	7zFM.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeRestorePrivilege	2680	7zFM.exe
Token: 35	2680	7zFM.exe
Token: SeSecurityPrivilege	2680	7zFM.exe
Token: SeDebugPrivilege	116	DesktopWindowManager.exe
Token: SeDebugPrivilege	4528	Desktop Window Manager.exe
Token: SeDebugPrivilege	1708	DcRat.exe

Suspicious use of FindShellTrayWindow 4 IoCs

pid	Process
2680	7zFM.exe
2680	7zFM.exe
2680	7zFM.exe
1708	DcRat.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1708	DcRat.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2680 wrote to memory of 4636	2680	7zFM.exe	99
PID 2680 wrote to memory of 4636	2680	7zFM.exe	99
PID 2680 wrote to memory of 4636	2680	7zFM.exe	99
PID 4636 wrote to memory of 4476	4636	DcRat.exe	102
PID 4636 wrote to memory of 4476	4636	DcRat.exe	102
PID 4636 wrote to memory of 4476	4636	DcRat.exe	102
PID 4476 wrote to memory of 1708	4476	WScript.exe	103
PID 4476 wrote to memory of 1708	4476	WScript.exe	103
PID 4476 wrote to memory of 116	4476	WScript.exe	104
PID 4476 wrote to memory of 116	4476	WScript.exe	104
PID 116 wrote to memory of 2408	116	DesktopWindowManager.exe	107
PID 116 wrote to memory of 2408	116	DesktopWindowManager.exe	107
PID 116 wrote to memory of 3416	116	DesktopWindowManager.exe	109
PID 116 wrote to memory of 3416	116	DesktopWindowManager.exe	109
PID 3416 wrote to memory of 2028	3416	cmd.exe	111
PID 3416 wrote to memory of 2028	3416	cmd.exe	111
PID 2408 wrote to memory of 3672	2408	cmd.exe	112
PID 2408 wrote to memory of 3672	2408	cmd.exe	112
PID 3416 wrote to memory of 4528	3416	cmd.exe	113
PID 3416 wrote to memory of 4528	3416	cmd.exe	113

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:\Program Files\7-Zip\7zFM.exe
"C:\Program Files\7-Zip\7zFM.exe" "C:\Users\Admin\AppData\Local\Temp\DcRat.zip"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:2680
- C:\Users\Admin\AppData\Local\Temp\7zO87AE09E7\DcRat.exe
  "C:\Users\Admin\AppData\Local\Temp\7zO87AE09E7\DcRat.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:4636
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\RarSFX0\run.vbs"
    3⤵
    - Checks computer location settings
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4476
  - - C:\Users\Admin\AppData\Local\Temp\RarSFX0\DcRat.exe
      "C:\Users\Admin\AppData\Local\Temp\RarSFX0\DcRat.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of FindShellTrayWindow
      Suspicious use of SendNotifyMessage
      PID:1708
  - - C:\Users\Admin\AppData\Local\Temp\RarSFX0\DesktopWindowManager.exe
      "C:\Users\Admin\AppData\Local\Temp\RarSFX0\DesktopWindowManager.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:116
    - - 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
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2408
      - 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"'
        6⤵
        Scheduled Task/Job: Scheduled Task
        
        PID:3672
    - - C:\Windows\system32\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpFC80.tmp.bat""
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3416
      - C:\Windows\system32\timeout.exe
        
        timeout 3
        6⤵
        Delays execution with timeout.exe
        
        PID:2028
      - C:\Users\Admin\AppData\Local\Temp\Desktop Window Manager.exe
        
        "C:\Users\Admin\AppData\Local\Temp\Desktop Window Manager.exe"
        6⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:4528

C:\Windows\system32\wbem\WmiApSrv.exe
C:\Windows\system32\wbem\WmiApSrv.exe
1⤵
PID:1976

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\7zO87AE09E7\DcRat.exe

Filesize
5.0MB

MD5
9a2706b014494988041a7cd721dc2e77

SHA1
5ca23535cb0abe9b1e5ca5466cf49323d62f1b78

SHA256
9fa9476e19afbc0b9a022a568fe765b793f4966e7e0e0910a2fd07a21a8d848d

SHA512
0c884f57267e478b131fe07b87ed41d6727fd678bd74c7e8b75de61f13f0365c185649453772cb7fefee96ddccb2d51b4d1a52edf551ea34faec1aa06ebbfdab

Download Submit
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\tmpFC80.tmp.bat

Filesize
169B

MD5
b1ca5709bd7d4219a9c7540dec950686

SHA1
d23297a52f7dfb5f81f1ee4bc8af01c081b5c4c0

SHA256
6699a7e3b428f7422430a88d8c55a118996e6131cd328afc8fe6817479f00610

SHA512
ed1b49f21e6bd3b084f60325fece5302d9257903747b6bfaa2aec972d0dd3c37db3930a9228e1732ef1ff35e5eb5592587ddbabbf79998e20bb006ed8bcbaa65

Download Submit
memory/116-22-0x0000000000E80000-0x0000000000E92000-memory.dmp

Filesize
72KB

Download
memory/1708-23-0x0000024B36880000-0x0000024B374CA000-memory.dmp

Filesize
12.3MB

Download