asyncrat | d21a63a1bcc5afdc0eb4b00e6b82af4bdf1f634e50d0d51001a4c27ac7f84379

Analysis

max time kernel
90s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
01-12-2024 10:45

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General

Target

1E45D6ABB8FA749D0FDE3EADD586E637.exe
Size

258KB
MD5

1e45d6abb8fa749d0fde3eadd586e637
SHA1

4a961b4a92fa3fb1265f729d18f2f0638cba018a
SHA256

d21a63a1bcc5afdc0eb4b00e6b82af4bdf1f634e50d0d51001a4c27ac7f84379
SHA512

58f30c478856230c16ae7bb8425e32e0dce23d927de1d7d4697400617609a3f5dfd9ceca98426b05e240ae515ba5408af569714c9d95e17652c0e83406762900
SSDEEP

3072:Xxjla5113NyCzPWYykCbXCfe8jtgszyAVibmbJ30U11xjZjsDQBxQh68:XZla513yAykOyG2gszyjm1EUTEDO

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

2.56.179.212:4445

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
THK.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

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

1E45D6ABB8FA749D0FDE3EADD586E637.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	1E45D6ABB8FA749D0FDE3EADD586E637.exe

Executes dropped EXE 3 IoCs

Processes:

THK.exeTHK.exeTHK.exe

pid	Process
832	THK.exe
1672	THK.exe
4208	THK.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

1E45D6ABB8FA749D0FDE3EADD586E637.exeTHK.exe

description	pid	Process	procid_target
PID 2696 set thread context of 952	2696	1E45D6ABB8FA749D0FDE3EADD586E637.exe	85
PID 832 set thread context of 4208	832	THK.exe	95

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 8 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

Processes:

THK.exeTHK.exe1E45D6ABB8FA749D0FDE3EADD586E637.exe1E45D6ABB8FA749D0FDE3EADD586E637.execmd.execmd.exeschtasks.exetimeout.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	THK.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	THK.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1E45D6ABB8FA749D0FDE3EADD586E637.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1E45D6ABB8FA749D0FDE3EADD586E637.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe

Delays execution with timeout.exe 1 IoCs

evasion

Processes:

timeout.exe

pid	Process
4384	timeout.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

Processes:

schtasks.exe

pid	Process
4848	schtasks.exe

Suspicious behavior: EnumeratesProcesses 25 IoCs

Processes:

1E45D6ABB8FA749D0FDE3EADD586E637.exeTHK.exe

pid	Process
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
832	THK.exe
832	THK.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

1E45D6ABB8FA749D0FDE3EADD586E637.exeTHK.exeTHK.exe

description	pid	Process
Token: SeDebugPrivilege	952	1E45D6ABB8FA749D0FDE3EADD586E637.exe
Token: SeDebugPrivilege	832	THK.exe
Token: SeDebugPrivilege	4208	THK.exe

Suspicious use of WriteProcessMemory 34 IoCs

Processes:

1E45D6ABB8FA749D0FDE3EADD586E637.exe1E45D6ABB8FA749D0FDE3EADD586E637.execmd.execmd.exeTHK.exe

description	pid	Process	procid_target
PID 2696 wrote to memory of 952	2696	1E45D6ABB8FA749D0FDE3EADD586E637.exe	85
PID 2696 wrote to memory of 952	2696	1E45D6ABB8FA749D0FDE3EADD586E637.exe	85
PID 2696 wrote to memory of 952	2696	1E45D6ABB8FA749D0FDE3EADD586E637.exe	85
PID 2696 wrote to memory of 952	2696	1E45D6ABB8FA749D0FDE3EADD586E637.exe	85
PID 2696 wrote to memory of 952	2696	1E45D6ABB8FA749D0FDE3EADD586E637.exe	85
PID 2696 wrote to memory of 952	2696	1E45D6ABB8FA749D0FDE3EADD586E637.exe	85
PID 2696 wrote to memory of 952	2696	1E45D6ABB8FA749D0FDE3EADD586E637.exe	85
PID 2696 wrote to memory of 952	2696	1E45D6ABB8FA749D0FDE3EADD586E637.exe	85
PID 952 wrote to memory of 208	952	1E45D6ABB8FA749D0FDE3EADD586E637.exe	87
PID 952 wrote to memory of 208	952	1E45D6ABB8FA749D0FDE3EADD586E637.exe	87
PID 952 wrote to memory of 208	952	1E45D6ABB8FA749D0FDE3EADD586E637.exe	87
PID 952 wrote to memory of 600	952	1E45D6ABB8FA749D0FDE3EADD586E637.exe	89
PID 952 wrote to memory of 600	952	1E45D6ABB8FA749D0FDE3EADD586E637.exe	89
PID 952 wrote to memory of 600	952	1E45D6ABB8FA749D0FDE3EADD586E637.exe	89
PID 208 wrote to memory of 4848	208	cmd.exe	91
PID 208 wrote to memory of 4848	208	cmd.exe	91
PID 208 wrote to memory of 4848	208	cmd.exe	91
PID 600 wrote to memory of 4384	600	cmd.exe	92
PID 600 wrote to memory of 4384	600	cmd.exe	92
PID 600 wrote to memory of 4384	600	cmd.exe	92
PID 600 wrote to memory of 832	600	cmd.exe	93
PID 600 wrote to memory of 832	600	cmd.exe	93
PID 600 wrote to memory of 832	600	cmd.exe	93
PID 832 wrote to memory of 1672	832	THK.exe	94
PID 832 wrote to memory of 1672	832	THK.exe	94
PID 832 wrote to memory of 1672	832	THK.exe	94
PID 832 wrote to memory of 4208	832	THK.exe	95
PID 832 wrote to memory of 4208	832	THK.exe	95
PID 832 wrote to memory of 4208	832	THK.exe	95
PID 832 wrote to memory of 4208	832	THK.exe	95
PID 832 wrote to memory of 4208	832	THK.exe	95
PID 832 wrote to memory of 4208	832	THK.exe	95
PID 832 wrote to memory of 4208	832	THK.exe	95
PID 832 wrote to memory of 4208	832	THK.exe	95

C:\Users\Admin\AppData\Local\Temp\1E45D6ABB8FA749D0FDE3EADD586E637.exe
"C:\Users\Admin\AppData\Local\Temp\1E45D6ABB8FA749D0FDE3EADD586E637.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2696
- C:\Users\Admin\AppData\Local\Temp\1E45D6ABB8FA749D0FDE3EADD586E637.exe
  "C:\Users\Admin\AppData\Local\Temp\1E45D6ABB8FA749D0FDE3EADD586E637.exe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:952
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "THK" /tr '"C:\Users\Admin\AppData\Roaming\THK.exe"' & exit
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:208
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "THK" /tr '"C:\Users\Admin\AppData\Roaming\THK.exe"'
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:4848
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpEBD7.tmp.bat""
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:600
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:4384
  - - C:\Users\Admin\AppData\Roaming\THK.exe
      "C:\Users\Admin\AppData\Roaming\THK.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:832
    - - C:\Users\Admin\AppData\Roaming\THK.exe
        
        "C:\Users\Admin\AppData\Roaming\THK.exe"
        5⤵
        Executes dropped EXE
        
        PID:1672
    - - C:\Users\Admin\AppData\Roaming\THK.exe
        
        "C:\Users\Admin\AppData\Roaming\THK.exe"
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        
        PID:4208

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

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\1E45D6ABB8FA749D0FDE3EADD586E637.exe.log

Filesize
1KB

MD5
7ebe314bf617dc3e48b995a6c352740c

SHA1
538f643b7b30f9231a3035c448607f767527a870

SHA256
48178f884b8a4dd96e330b210b0530667d9473a7629fc6b4ad12b614bf438ee8

SHA512
0ba9d8f4244c15285e254d27b4bff7c49344ff845c48bc0bf0d8563072fab4d6f7a6abe6b6742e8375a08e9a3b3e5d5dc4937ab428dbe2dd8e62892fda04507e

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpEBD7.tmp.bat

Filesize
147B

MD5
baa3dd5608c2808178b1b94fc33cddac

SHA1
66eb6ad3a16b99d3aaeed0afd9afdff9dbad66fd

SHA256
b7e01c9802780ebc57bd7894215d86834805feb79a5a2abc3242e61d42291130

SHA512
a6ffecb9860907ccabe0312b84143d70ceaef7791d8e1a6d71c7671be5d9a33226e50897ae2ceda7feefdc6c2f86eff42333fec4db32296f3c5d1123e1a8b2c2

Download Submit
C:\Users\Admin\AppData\Roaming\THK.exe

Filesize
258KB

MD5
1e45d6abb8fa749d0fde3eadd586e637

SHA1
4a961b4a92fa3fb1265f729d18f2f0638cba018a

SHA256
d21a63a1bcc5afdc0eb4b00e6b82af4bdf1f634e50d0d51001a4c27ac7f84379

SHA512
58f30c478856230c16ae7bb8425e32e0dce23d927de1d7d4697400617609a3f5dfd9ceca98426b05e240ae515ba5408af569714c9d95e17652c0e83406762900

Download Submit
memory/952-8-0x00000000752C0000-0x0000000075A70000-memory.dmp

Filesize
7.7MB

Download
memory/952-11-0x00000000752C0000-0x0000000075A70000-memory.dmp

Filesize
7.7MB

Download
memory/952-17-0x00000000752C0000-0x0000000075A70000-memory.dmp

Filesize
7.7MB

Download
memory/952-12-0x0000000004F60000-0x0000000004FFC000-memory.dmp

Filesize
624KB

Download
memory/952-7-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2696-0-0x00000000752CE000-0x00000000752CF000-memory.dmp

Filesize
4KB

Download
memory/2696-10-0x00000000752C0000-0x0000000075A70000-memory.dmp

Filesize
7.7MB

Download
memory/2696-4-0x0000000004E10000-0x0000000004E1A000-memory.dmp

Filesize
40KB

Download
memory/2696-6-0x0000000004E30000-0x0000000004E48000-memory.dmp

Filesize
96KB

Download
memory/2696-3-0x0000000004D00000-0x0000000004D92000-memory.dmp

Filesize
584KB

Download
memory/2696-5-0x00000000752C0000-0x0000000075A70000-memory.dmp

Filesize
7.7MB

Download
memory/2696-2-0x00000000052B0000-0x0000000005854000-memory.dmp

Filesize
5.6MB

Download
memory/2696-1-0x00000000002A0000-0x00000000002E6000-memory.dmp

Filesize
280KB

Download
memory/4208-28-0x0000000006250000-0x00000000062B6000-memory.dmp

Filesize
408KB

Download