asyncrat | 7fdd7e02c94fd64e1a19e51f03dd0819b23437711690882d5ca765997f2447e7

Analysis

max time kernel
493s
max time network
593s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
23-05-2024 12:45

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General

Target

msimg32.dll
Size

44.7MB
MD5

ce551ef0eead129588bd522b032329a6
SHA1

af451cb0e8bd8a72e16df7c861a47389d060fec9
SHA256

e9a221f17124d3472c612e242f39b28106ea0391774a9a8c394040af34e3920a
SHA512

112ab3d2d1c437e127876d87c074aebe8081503f327816d00453799b1e5307b1163f7de52324ee4e8b195db7ae1f0930677d9d5e984d16532895ed8d88c31ba1
SSDEEP

786432:wUP7GCGO7t0Srkx/tC0SzIdSwh/WxbpNHQD3trzRpc1:wUP7GCG6iSrkx1hSzYsHQD3t/RO1

Score

10^/10

asyncrat cpa persistence rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

CPA

5.253.84.218:54657

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
false
install_folder
%AppData%

aes.plain

Signatures

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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

reg.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3699363923-1875576828-3287151903-1000\Software\Microsoft\Windows\CurrentVersion\Run\*ChromeUpdate = "rundll32.exe C:\\Users\\Admin\\Documents\\ChromeData.dll,EntryPoint"	reg.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

regsvr32.exe

description pid process target process

PID 2396 set thread context of 204 2396 regsvr32.exe csc.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

csc.exe

description pid process

Token: SeDebugPrivilege 204 csc.exe

description	pid	process	target process
PID 2396 set thread context of 204	2396	regsvr32.exe	csc.exe

description	pid	process
Token: SeDebugPrivilege	204	csc.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

regsvr32.exeregsvr32.execmd.exe

description	pid	process	target process
PID 1948 wrote to memory of 2396	1948	regsvr32.exe	regsvr32.exe
PID 1948 wrote to memory of 2396	1948	regsvr32.exe	regsvr32.exe
PID 1948 wrote to memory of 2396	1948	regsvr32.exe	regsvr32.exe
PID 2396 wrote to memory of 204	2396	regsvr32.exe	csc.exe
PID 2396 wrote to memory of 204	2396	regsvr32.exe	csc.exe
PID 2396 wrote to memory of 204	2396	regsvr32.exe	csc.exe
PID 2396 wrote to memory of 204	2396	regsvr32.exe	csc.exe
PID 2396 wrote to memory of 204	2396	regsvr32.exe	csc.exe
PID 2396 wrote to memory of 4692	2396	regsvr32.exe	cmd.exe
PID 2396 wrote to memory of 4692	2396	regsvr32.exe	cmd.exe
PID 2396 wrote to memory of 4692	2396	regsvr32.exe	cmd.exe
PID 4692 wrote to memory of 4700	4692	cmd.exe	reg.exe
PID 4692 wrote to memory of 4700	4692	cmd.exe	reg.exe
PID 4692 wrote to memory of 4700	4692	cmd.exe	reg.exe

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\msimg32.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:1948
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\msimg32.dll
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:2396
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:204
- - C:\Windows\SysWOW64\cmd.exe
    cmd.exe /C reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*ChromeUpdate" /t REG_SZ /d "rundll32.exe C:\Users\Admin\Documents\ChromeData.dll",EntryPoint /f & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4692
  - - C:\Windows\SysWOW64\reg.exe
      reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*ChromeUpdate" /t REG_SZ /d "rundll32.exe C:\Users\Admin\Documents\ChromeData.dll",EntryPoint /f
      4⤵
      Adds Run key to start application
      PID:4700

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/204-3-0x0000000004FA0000-0x0000000004FB2000-memory.dmp

Filesize
72KB

Download
memory/204-17-0x000000000A170000-0x000000000A20C000-memory.dmp

Filesize
624KB

Download
memory/204-18-0x000000000A710000-0x000000000AC0E000-memory.dmp

Filesize
5.0MB

Download
memory/204-19-0x000000000A280000-0x000000000A2E6000-memory.dmp

Filesize
408KB

Download
memory/2396-1-0x00000000102E6000-0x0000000010300000-memory.dmp

Filesize
104KB

Download
memory/2396-0-0x0000000010000000-0x0000000012D6B000-memory.dmp

Filesize
45.4MB

Download
memory/2396-2-0x0000000010000000-0x0000000012D6B000-memory.dmp

Filesize
45.4MB

Download
memory/2396-4-0x0000000010000000-0x0000000012D6B000-memory.dmp

Filesize
45.4MB

Download
memory/2396-8-0x0000000010000000-0x0000000012D6B000-memory.dmp

Filesize
45.4MB

Download
memory/2396-10-0x0000000012D02000-0x0000000012D09000-memory.dmp

Filesize
28KB

Download