asyncrat | 5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e

General

Target

flemme.exe
Size

112KB
MD5

2dd4a3e79a430fcf80e0c16c059c4c2c
SHA1

b32b851bb2746acfa2035d6765f7827e5880debb
SHA256

5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e
SHA512

cae7ef83d8eb0f77d018dae6327b46cbb61e68623d64551492f883b9903a00ff410a9bda7c84f4348497e55b34490b315f855b95288e71710076cb246863a6a4
SSDEEP

3072:IucJTUUk2QGjf93SybKeYOQpiGU0tFsHEx:IucjNrr9CybEOq5

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
behavioral2/files/0x00080000000229eb-11.dat	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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\International\Geo\Nation	flemme.exe

Executes dropped EXE 1 IoCs

pid	Process
432	executorroblox.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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	executorroblox.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2676	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
1716	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe
1052	flemme.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1052	flemme.exe
Token: SeDebugPrivilege	432	executorroblox.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1052 wrote to memory of 2020	1052	flemme.exe	85
PID 1052 wrote to memory of 2020	1052	flemme.exe	85
PID 1052 wrote to memory of 2020	1052	flemme.exe	85
PID 1052 wrote to memory of 5048	1052	flemme.exe	87
PID 1052 wrote to memory of 5048	1052	flemme.exe	87
PID 1052 wrote to memory of 5048	1052	flemme.exe	87
PID 2020 wrote to memory of 1716	2020	cmd.exe	89
PID 2020 wrote to memory of 1716	2020	cmd.exe	89
PID 2020 wrote to memory of 1716	2020	cmd.exe	89
PID 5048 wrote to memory of 2676	5048	cmd.exe	90
PID 5048 wrote to memory of 2676	5048	cmd.exe	90
PID 5048 wrote to memory of 2676	5048	cmd.exe	90
PID 5048 wrote to memory of 432	5048	cmd.exe	91
PID 5048 wrote to memory of 432	5048	cmd.exe	91
PID 5048 wrote to memory of 432	5048	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\flemme.exe
"C:\Users\Admin\AppData\Local\Temp\flemme.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1052
- 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:2020
- - 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:1716
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC534.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5048
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2676
- - 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:432

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

Query Registry

1

T1012

System Information Discovery

2

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

C:\Users\Admin\AppData\Local\Temp\tmpC534.tmp.bat

Filesize
158B

MD5
ef242ca31ef8f6d4a24a56411839b0e7

SHA1
86f787c0a86affe3c7440a94baa1ea0e1d3d8f9a

SHA256
5fc9c56981f3ce7be58dca13f1ea38bb2f9cb0d96c7d0a2daa83ca36ff19f7a5

SHA512
86f9796395661fa043a42cbc4bb557a651dd374f2cbc55c1f6cdb21181ec2b4789c94b8d1b5fe66ae014c5f7c368fb255670ae0d70feb6ac42f497a87f64c5fe

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

Filesize
112KB

MD5
2dd4a3e79a430fcf80e0c16c059c4c2c

SHA1
b32b851bb2746acfa2035d6765f7827e5880debb

SHA256
5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e

SHA512
cae7ef83d8eb0f77d018dae6327b46cbb61e68623d64551492f883b9903a00ff410a9bda7c84f4348497e55b34490b315f855b95288e71710076cb246863a6a4

Download Submit
memory/432-13-0x0000000074B80000-0x0000000075330000-memory.dmp

Filesize
7.7MB

Download
memory/432-14-0x0000000074B80000-0x0000000075330000-memory.dmp

Filesize
7.7MB

Download
memory/432-15-0x0000000074B80000-0x0000000075330000-memory.dmp

Filesize
7.7MB

Download
memory/432-16-0x0000000074B80000-0x0000000075330000-memory.dmp

Filesize
7.7MB

Download
memory/1052-0-0x0000000074C1E000-0x0000000074C1F000-memory.dmp

Filesize
4KB

Download
memory/1052-1-0x0000000000600000-0x0000000000622000-memory.dmp

Filesize
136KB

Download
memory/1052-2-0x0000000074C10000-0x00000000753C0000-memory.dmp

Filesize
7.7MB

Download
memory/1052-3-0x0000000005060000-0x00000000050FC000-memory.dmp

Filesize
624KB

Download
memory/1052-8-0x0000000074C10000-0x00000000753C0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads