asyncrat | 5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e

General

Target
flemme.exe
Size 112KB
Sample240803-cpybrsvblg
SHA256 5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e
MD5 2dd4a3e79a430fcf80e0c16c059c4c2c
SHA1 b32b851bb2746acfa2035d6765f7827e5880debb
SHA512 cae7ef83d8eb0f77d018dae6327b46cbb61e68623d64551492f883b9903a00ff410a9bda7c84f4348497e55b34490b315f855b95288e71710076cb246863a6a4
SSDEEP 3072:IucJTUUk2QGjf93SybKeYOQpiGU0tFsHEx:IucjNrr9CybEOq5
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:6606
127.0.0.1:7707

Mutex

zou2AAxxuspP

Attributes

delay
3
install
true
install_file
executorroblox.exe
install_folder
%AppData%

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x000f000000013423-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2756	executorroblox.exe

Loads dropped DLL 1 IoCs

pid	Process
2808	cmd.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 6 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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	executorroblox.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	flemme.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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2140	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

pid	Process
2256	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2604	flemme.exe
2604	flemme.exe
2604	flemme.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2604	flemme.exe
Token: SeDebugPrivilege	2756	executorroblox.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2604 wrote to memory of 316	2604	flemme.exe	31
PID 2604 wrote to memory of 316	2604	flemme.exe	31
PID 2604 wrote to memory of 316	2604	flemme.exe	31
PID 2604 wrote to memory of 316	2604	flemme.exe	31
PID 2604 wrote to memory of 2808	2604	flemme.exe	33
PID 2604 wrote to memory of 2808	2604	flemme.exe	33
PID 2604 wrote to memory of 2808	2604	flemme.exe	33
PID 2604 wrote to memory of 2808	2604	flemme.exe	33
PID 316 wrote to memory of 2256	316	cmd.exe	35
PID 316 wrote to memory of 2256	316	cmd.exe	35
PID 316 wrote to memory of 2256	316	cmd.exe	35
PID 316 wrote to memory of 2256	316	cmd.exe	35
PID 2808 wrote to memory of 2140	2808	cmd.exe	36
PID 2808 wrote to memory of 2140	2808	cmd.exe	36
PID 2808 wrote to memory of 2140	2808	cmd.exe	36
PID 2808 wrote to memory of 2140	2808	cmd.exe	36
PID 2808 wrote to memory of 2756	2808	cmd.exe	37
PID 2808 wrote to memory of 2756	2808	cmd.exe	37
PID 2808 wrote to memory of 2756	2808	cmd.exe	37
PID 2808 wrote to memory of 2756	2808	cmd.exe	37

C:\Users\Admin\AppData\Local\Temp\flemme.exe
"C:\Users\Admin\AppData\Local\Temp\flemme.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2604
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "executorroblox" /tr '"C:\Users\Admin\AppData\Roaming\executorroblox.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:316
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "executorroblox" /tr '"C:\Users\Admin\AppData\Roaming\executorroblox.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2256
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpE2C1.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2808
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2140
- - C:\Users\Admin\AppData\Roaming\executorroblox.exe
    "C:\Users\Admin\AppData\Roaming\executorroblox.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2756

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmpE2C1.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpE2C1.tmp.bat
Size 158B
SHA256 ab89fcf4e004ef1707a3261a8ba9582fa7cb9dc4623f6f4cc0955d0e5f10bcc9
MD5 d001c657ff868f11c827df83ef18eec6
SHA1 6f267d7e728abcf0f0d16349254e89c2ecfb2dd1
SHA512 a73c0900a7da5df3fcce0a5bfa3779dcb564d2237f9a75291de704827ed7c45585064a2ec9d2afdac1717e5593a9f5e2de7f144d1d61d291056623d027d6347f
MD5 SHA1 SHA512

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executorroblox.exe

Path \Users\Admin\AppData\Roaming\executorroblox.exe
Size 112KB
SHA256 5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e
MD5 2dd4a3e79a430fcf80e0c16c059c4c2c
SHA1 b32b851bb2746acfa2035d6765f7827e5880debb
SHA512 cae7ef83d8eb0f77d018dae6327b46cbb61e68623d64551492f883b9903a00ff410a9bda7c84f4348497e55b34490b315f855b95288e71710076cb246863a6a4
SSDEEP 3072:IucJTUUk2QGjf93SybKeYOQpiGU0tFsHEx:IucjNrr9CybEOq5
MD5 SHA1 SHA512 SSDEEP

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memory/2604-0-0x000000007497E000-0x000000007497F000-memory.dmp

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memory/2604-1-0x0000000000320000-0x0000000000342000-memory.dmp

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memory/2604-2-0x0000000074970000-0x000000007505E000-memory.dmp

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memory/2604-12-0x0000000074970000-0x000000007505E000-memory.dmp

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memory/2756-16-0x0000000001020000-0x0000000001042000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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