asyncrat | 1a9e9deb92ea9d2cd35f94b5b0cfaecfd353fe71d886aa0ee4da2d7b454427aa

Analysis

max time kernel
4294180s
max time network
150s
platform
windows7_x64
resource
win7-20220311-en
submitted
28/03/2022, 10:17

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General

Target
Purchase Order15422.exe
Size 1.2MB
Sample220328-mbcs1sheb2
SHA256 1a9e9deb92ea9d2cd35f94b5b0cfaecfd353fe71d886aa0ee4da2d7b454427aa
MD5 ae942339e512444b692e2a1f8ad32828
SHA1 54ca07035c9e6488fbaa974f3d6c64c82e9597b9
SHA512 072342051d8bf471bd630524f512efcddf1ef556790aa8035b26220583a273d28fa89d6f7faae09fbc4bbdc0dad61292172a7e6322326cb8966dba93f38ea659
MD5 SHA1 SHA512

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

Mutex

asjdfnaf;ma;lsd6SI8OkPnk

Attributes

delay
3
install
false
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/Msa6vJjt

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat

Async RAT payload 6 IoCs

rat

resource	yara_rule
behavioral1/memory/1740-65-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1740-66-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1740-67-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1740-68-0x000000000040C76E-mapping.dmp	asyncrat
behavioral1/memory/1740-70-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1740-72-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1636 set thread context of 1740	1636	Purchase Order15422.exe	34

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
296	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
1636	Purchase Order15422.exe
1636	Purchase Order15422.exe
1636	Purchase Order15422.exe
1636	Purchase Order15422.exe
1636	Purchase Order15422.exe
1636	Purchase Order15422.exe
1636	Purchase Order15422.exe
1636	Purchase Order15422.exe
1636	Purchase Order15422.exe
1636	Purchase Order15422.exe
1636	Purchase Order15422.exe
1568	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1636	Purchase Order15422.exe
Token: SeDebugPrivilege	1568	powershell.exe
Token: SeDebugPrivilege	1740	MSBuild.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 1636 wrote to memory of 1568	1636	Purchase Order15422.exe	29
PID 1636 wrote to memory of 1568	1636	Purchase Order15422.exe	29
PID 1636 wrote to memory of 1568	1636	Purchase Order15422.exe	29
PID 1636 wrote to memory of 1568	1636	Purchase Order15422.exe	29
PID 1636 wrote to memory of 296	1636	Purchase Order15422.exe	31
PID 1636 wrote to memory of 296	1636	Purchase Order15422.exe	31
PID 1636 wrote to memory of 296	1636	Purchase Order15422.exe	31
PID 1636 wrote to memory of 296	1636	Purchase Order15422.exe	31
PID 1636 wrote to memory of 668	1636	Purchase Order15422.exe	33
PID 1636 wrote to memory of 668	1636	Purchase Order15422.exe	33
PID 1636 wrote to memory of 668	1636	Purchase Order15422.exe	33
PID 1636 wrote to memory of 668	1636	Purchase Order15422.exe	33
PID 1636 wrote to memory of 1740	1636	Purchase Order15422.exe	34
PID 1636 wrote to memory of 1740	1636	Purchase Order15422.exe	34
PID 1636 wrote to memory of 1740	1636	Purchase Order15422.exe	34
PID 1636 wrote to memory of 1740	1636	Purchase Order15422.exe	34
PID 1636 wrote to memory of 1740	1636	Purchase Order15422.exe	34
PID 1636 wrote to memory of 1740	1636	Purchase Order15422.exe	34
PID 1636 wrote to memory of 1740	1636	Purchase Order15422.exe	34
PID 1636 wrote to memory of 1740	1636	Purchase Order15422.exe	34
PID 1636 wrote to memory of 1740	1636	Purchase Order15422.exe	34

C:\Users\Admin\AppData\Local\Temp\Purchase Order15422.exe
"C:\Users\Admin\AppData\Local\Temp\Purchase Order15422.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1636
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\ulGvEhQeF.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1568
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\ulGvEhQeF" /XML "C:\Users\Admin\AppData\Local\Temp\tmp3B7A.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:296
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
  2⤵
  PID:668
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1740

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Web Service

T1102

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

tmp3B7A.tmp

Path C:\Users\Admin\AppData\Local\Temp\tmp3B7A.tmp
Size 1KB
SHA256 44a169bb43c5fbba87ebeb5fb79a484640fce8a7bca3e8a80fe81f62f972e219
MD5 bbe92ed360b7ce4d8225588fa1bc2123
SHA1 cc6ebada31ed2fa7619a22727ab92f801700c846
SHA512 456d1800aab8f43601ad555930d64a8f407eb38cadc54b01d9f1f4c033d3d31dd6ea7f6a82520512bf2a4518d7787ec1baa12f16c8ea45ccb7e68b3bc5dd4dfb
MD5 SHA1 SHA512

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memory/1568-73-0x000000006EA60000-0x000000006F00B000-memory.dmp

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memory/1568-59-0x00000000755A1000-0x00000000755A3000-memory.dmp

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memory/1568-74-0x0000000002500000-0x000000000314A000-memory.dmp

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memory/1636-55-0x0000000000390000-0x000000000039A000-memory.dmp

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memory/1636-56-0x0000000006000000-0x00000000060DA000-memory.dmp

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memory/1636-61-0x0000000004760000-0x0000000004772000-memory.dmp

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memory/1636-54-0x0000000000AA0000-0x0000000000BCE000-memory.dmp

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memory/1740-62-0x0000000000400000-0x0000000000412000-memory.dmp

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memory/1740-66-0x0000000000400000-0x0000000000412000-memory.dmp

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memory/1740-67-0x0000000000400000-0x0000000000412000-memory.dmp

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memory/1740-70-0x0000000000400000-0x0000000000412000-memory.dmp

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memory/1740-72-0x0000000000400000-0x0000000000412000-memory.dmp

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memory/1740-65-0x0000000000400000-0x0000000000412000-memory.dmp

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memory/1740-63-0x0000000000400000-0x0000000000412000-memory.dmp

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