asyncrat | 72e7f51955137137fbdaee4a2b4874e3173f96fd5067fdfecb088ff3b790aa15

Analysis

max time kernel
128s
max time network
138s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
26/12/2024, 20:51

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General

Target

38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe
Size

694KB
MD5

32c67f99f3c95ba5e1816ca208f9b723
SHA1

c1e29ecea3c87d671448b9dbcc8d8c67b0d14b7e
SHA256

38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7
SHA512

578526bda2f08948475726f36bf247aabeb8f3941f95153d6786bc0db6e43bad44502ef1757bae2bb7c6f6bd0a4bd51e9b33ae363be293b75f490a26c03795f8
SSDEEP

12288:btoKggb2iNdvpc++pd1yIBbrk4ct0gdK/5SVns2M2TgN/0s:5oKgK1XpSpGIZn9+YSVsggi

Score

10^/10

asyncrat default discovery execution rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

37.0.14.198:6161

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
.exe
install_folder
%AppData%

aes.plain

Signatures

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

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2676	powershell.exe
2796	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
1604	.exe
1492	.exe

Loads dropped DLL 2 IoCs

pid	Process
1248	cmd.exe
1604	.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2324 set thread context of 2792	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	35
PID 1604 set thread context of 1492	1604	.exe	48

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 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1672	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2052	schtasks.exe
2576	schtasks.exe
2472	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2676	powershell.exe
2792	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe
2792	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe
2792	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe
2796	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2676	powershell.exe
Token: SeDebugPrivilege	2792	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe
Token: SeDebugPrivilege	2796	powershell.exe
Token: SeDebugPrivilege	1492	.exe

Suspicious use of WriteProcessMemory 54 IoCs

description	pid	Process	procid_target
PID 2324 wrote to memory of 2676	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	31
PID 2324 wrote to memory of 2676	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	31
PID 2324 wrote to memory of 2676	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	31
PID 2324 wrote to memory of 2676	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	31
PID 2324 wrote to memory of 2576	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	33
PID 2324 wrote to memory of 2576	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	33
PID 2324 wrote to memory of 2576	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	33
PID 2324 wrote to memory of 2576	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	33
PID 2324 wrote to memory of 2792	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	35
PID 2324 wrote to memory of 2792	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	35
PID 2324 wrote to memory of 2792	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	35
PID 2324 wrote to memory of 2792	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	35
PID 2324 wrote to memory of 2792	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	35
PID 2324 wrote to memory of 2792	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	35
PID 2324 wrote to memory of 2792	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	35
PID 2324 wrote to memory of 2792	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	35
PID 2324 wrote to memory of 2792	2324	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	35
PID 2792 wrote to memory of 484	2792	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	36
PID 2792 wrote to memory of 484	2792	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	36
PID 2792 wrote to memory of 484	2792	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	36
PID 2792 wrote to memory of 484	2792	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	36
PID 2792 wrote to memory of 1248	2792	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	38
PID 2792 wrote to memory of 1248	2792	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	38
PID 2792 wrote to memory of 1248	2792	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	38
PID 2792 wrote to memory of 1248	2792	38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe	38
PID 484 wrote to memory of 2472	484	cmd.exe	40
PID 484 wrote to memory of 2472	484	cmd.exe	40
PID 484 wrote to memory of 2472	484	cmd.exe	40
PID 484 wrote to memory of 2472	484	cmd.exe	40
PID 1248 wrote to memory of 1672	1248	cmd.exe	41
PID 1248 wrote to memory of 1672	1248	cmd.exe	41
PID 1248 wrote to memory of 1672	1248	cmd.exe	41
PID 1248 wrote to memory of 1672	1248	cmd.exe	41
PID 1248 wrote to memory of 1604	1248	cmd.exe	42
PID 1248 wrote to memory of 1604	1248	cmd.exe	42
PID 1248 wrote to memory of 1604	1248	cmd.exe	42
PID 1248 wrote to memory of 1604	1248	cmd.exe	42
PID 1604 wrote to memory of 2796	1604	.exe	44
PID 1604 wrote to memory of 2796	1604	.exe	44
PID 1604 wrote to memory of 2796	1604	.exe	44
PID 1604 wrote to memory of 2796	1604	.exe	44
PID 1604 wrote to memory of 2052	1604	.exe	46
PID 1604 wrote to memory of 2052	1604	.exe	46
PID 1604 wrote to memory of 2052	1604	.exe	46
PID 1604 wrote to memory of 2052	1604	.exe	46
PID 1604 wrote to memory of 1492	1604	.exe	48
PID 1604 wrote to memory of 1492	1604	.exe	48
PID 1604 wrote to memory of 1492	1604	.exe	48
PID 1604 wrote to memory of 1492	1604	.exe	48
PID 1604 wrote to memory of 1492	1604	.exe	48
PID 1604 wrote to memory of 1492	1604	.exe	48
PID 1604 wrote to memory of 1492	1604	.exe	48
PID 1604 wrote to memory of 1492	1604	.exe	48
PID 1604 wrote to memory of 1492	1604	.exe	48

C:\Users\Admin\AppData\Local\Temp\38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe
"C:\Users\Admin\AppData\Local\Temp\38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2324
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\nxBIuIS.exe"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2676
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\nxBIuIS" /XML "C:\Users\Admin\AppData\Local\Temp\tmp88CF.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2576
- C:\Users\Admin\AppData\Local\Temp\38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe
  "C:\Users\Admin\AppData\Local\Temp\38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2792
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "" /tr '"C:\Users\Admin\AppData\Roaming\.exe"' & exit
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:484
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "" /tr '"C:\Users\Admin\AppData\Roaming\.exe"'
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:2472
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp97AD.tmp.bat""
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1248
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:1672
  - - C:\Users\Admin\AppData\Roaming\.exe
      "C:\Users\Admin\AppData\Roaming\.exe"
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:1604
    - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\nxBIuIS.exe"
        5⤵
        Command and Scripting Interpreter: PowerShell
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2796
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\nxBIuIS" /XML "C:\Users\Admin\AppData\Local\Temp\tmp558F.tmp"
        5⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:2052
    - - C:\Users\Admin\AppData\Roaming\.exe
        
        "C:\Users\Admin\AppData\Roaming\.exe"
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        
        PID:1492

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

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

System Information Discovery

T1082

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\tmp88CF.tmp

Filesize
1KB

MD5
4f90a7174bb34b400a64202a8c28ab57

SHA1
3d78ef9e7468afeb417af90f8aebed71e27669b8

SHA256
28bff45b4da73c2901a2388c85e3447680cd6f6541f543f6b2f62be5b0ee03a3

SHA512
b2466543740950bc2cb4ccc0194118ba8ea71bc26480fd32405de9bb1aeeb8d09196bd3c2eb5efabcf966cb634102087a892f580d5d9059142e0ace6f7830ea7

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp97AD.tmp.bat

Filesize
144B

MD5
49c7432bf76bf15717378e926ef90989

SHA1
280e34076f9ad4485674552a8ead54ed9b2719d1

SHA256
d29608900b6494810b447c7a853cd89ba7a11dcf13853588b4f0ba20cd8a63fb

SHA512
1c39eea4c73625389ef1161470d5d2c12b63611135a0e47cf916f2bbddc46b5dba17630e600c4a439318f9c28b38fa9ba09fe03d276ca574d2278fbaa507350e

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\VY5P8G29UN857R5HYKC2.temp

Filesize
7KB

MD5
ae52db759c9c845232948e3334b98364

SHA1
7b9526b9af163debb48d49cd2733dad282b903b3

SHA256
032d14063c9a4efcd702b6998b86d6c34f2267294cbe5c8efccbedf9f2e9d914

SHA512
deaac5507addce40033341dda9fb52ff75d4ae5483e2958dfa23cd30f402299d300c7c7e3033d895dfbba04856e2edce6c95ffe1558f90cd176c87eed015a80e

Download Submit
\Users\Admin\AppData\Roaming\.exe

Filesize
694KB

MD5
32c67f99f3c95ba5e1816ca208f9b723

SHA1
c1e29ecea3c87d671448b9dbcc8d8c67b0d14b7e

SHA256
38e1bbae005365e92cf80aa6ef199d5107af57fde3afb02c31dc1bde875c68f7

SHA512
578526bda2f08948475726f36bf247aabeb8f3941f95153d6786bc0db6e43bad44502ef1757bae2bb7c6f6bd0a4bd51e9b33ae363be293b75f490a26c03795f8

Download Submit
memory/1492-56-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1492-60-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1492-62-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1604-44-0x0000000004C20000-0x0000000004C74000-memory.dmp

Filesize
336KB

Download
memory/1604-42-0x00000000012E0000-0x0000000001394000-memory.dmp

Filesize
720KB

Download
memory/1604-43-0x00000000004D0000-0x00000000004F4000-memory.dmp

Filesize
144KB

Download
memory/2324-7-0x0000000004A60000-0x0000000004AB4000-memory.dmp

Filesize
336KB

Download
memory/2324-15-0x0000000002320000-0x0000000002334000-memory.dmp

Filesize
80KB

Download
memory/2324-1-0x0000000000B30000-0x0000000000BE4000-memory.dmp

Filesize
720KB

Download
memory/2324-2-0x0000000074610000-0x0000000074CFE000-memory.dmp

Filesize
6.9MB

Download
memory/2324-3-0x0000000000420000-0x0000000000444000-memory.dmp

Filesize
144KB

Download
memory/2324-4-0x000000007461E000-0x000000007461F000-memory.dmp

Filesize
4KB

Download
memory/2324-5-0x0000000074610000-0x0000000074CFE000-memory.dmp

Filesize
6.9MB

Download
memory/2324-6-0x00000000004A0000-0x00000000004AC000-memory.dmp

Filesize
48KB

Download
memory/2324-29-0x0000000074610000-0x0000000074CFE000-memory.dmp

Filesize
6.9MB

Download
memory/2324-0-0x000000007461E000-0x000000007461F000-memory.dmp

Filesize
4KB

Download
memory/2792-16-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2792-25-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2792-26-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2792-28-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2792-24-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2792-20-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2792-22-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2792-18-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download