asyncrat | 99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883

General

Target

image logger.exe
Size

312KB
MD5

520e6035e15a9422e1c4cbada69263aa
SHA1

96915e5d6adf90533c2309c84e226598773d83ec
SHA256

99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883
SHA512

ffcf1ff0d9161bdc9c1bbdedc66bccb8bcf74874d25ff4f4436c57aa417160c55914ccb9cb97645c728dd4d230908f707733c30c53faeb0bbfd71e6306999b3b
SSDEEP

6144:Eu6ABA0Krb3LVhA+EWHYSS66Wy6666D6b6666H666K666Z2v666y7N6oZCGEB6ax:EwKXRlYSS66Wy6666D6b6666H666K666

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

18.141.204.5:80

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
syteam.exe
install_folder
%Temp%

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x000b000000023b77-11.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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	image logger.exe

Executes dropped EXE 1 IoCs

pid	Process
4952	syteam.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	cmd.exe
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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	syteam.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	image logger.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2896	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
2836	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe
4504	image logger.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4504	image logger.exe
Token: SeDebugPrivilege	4952	syteam.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4504 wrote to memory of 1744	4504	image logger.exe	82
PID 4504 wrote to memory of 1744	4504	image logger.exe	82
PID 4504 wrote to memory of 1744	4504	image logger.exe	82
PID 4504 wrote to memory of 4628	4504	image logger.exe	84
PID 4504 wrote to memory of 4628	4504	image logger.exe	84
PID 4504 wrote to memory of 4628	4504	image logger.exe	84
PID 4628 wrote to memory of 2896	4628	cmd.exe	86
PID 4628 wrote to memory of 2896	4628	cmd.exe	86
PID 4628 wrote to memory of 2896	4628	cmd.exe	86
PID 1744 wrote to memory of 2836	1744	cmd.exe	87
PID 1744 wrote to memory of 2836	1744	cmd.exe	87
PID 1744 wrote to memory of 2836	1744	cmd.exe	87
PID 4628 wrote to memory of 4952	4628	cmd.exe	88
PID 4628 wrote to memory of 4952	4628	cmd.exe	88
PID 4628 wrote to memory of 4952	4628	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\image logger.exe
"C:\Users\Admin\AppData\Local\Temp\image logger.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4504
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "syteam" /tr '"C:\Users\Admin\AppData\Local\Temp\syteam.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1744
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "syteam" /tr '"C:\Users\Admin\AppData\Local\Temp\syteam.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2836
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA26A.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4628
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2896
- - C:\Users\Admin\AppData\Local\Temp\syteam.exe
    "C:\Users\Admin\AppData\Local\Temp\syteam.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:4952

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\syteam.exe

Filesize
312KB

MD5
520e6035e15a9422e1c4cbada69263aa

SHA1
96915e5d6adf90533c2309c84e226598773d83ec

SHA256
99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883

SHA512
ffcf1ff0d9161bdc9c1bbdedc66bccb8bcf74874d25ff4f4436c57aa417160c55914ccb9cb97645c728dd4d230908f707733c30c53faeb0bbfd71e6306999b3b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpA26A.tmp.bat

Filesize
153B

MD5
beccb43bdfc7bdbfaaf39c69e51320bd

SHA1
95037682c845a7fd6a03ea45ccb632e5e1b995e1

SHA256
b3a483d4033d4d38dabf70d25de29f5b0f8fd8a56061368fa0ab1752d297a330

SHA512
416440a69c73e433de39d8bd82649105e058f5a9b9d09294f927128b0e5053d8abd2e7b72e044307c11089d878d29be86158391f96a27d0d4e932678f4e24cfe

Download Submit
memory/4504-0-0x000000007516E000-0x000000007516F000-memory.dmp

Filesize
4KB

Download
memory/4504-1-0x0000000000F30000-0x0000000000F84000-memory.dmp

Filesize
336KB

Download
memory/4504-2-0x0000000075160000-0x0000000075910000-memory.dmp

Filesize
7.7MB

Download
memory/4504-3-0x00000000059B0000-0x0000000005A4C000-memory.dmp

Filesize
624KB

Download
memory/4504-8-0x0000000075160000-0x0000000075910000-memory.dmp

Filesize
7.7MB

Download
memory/4952-13-0x00000000750D0000-0x0000000075880000-memory.dmp

Filesize
7.7MB

Download
memory/4952-14-0x00000000750D0000-0x0000000075880000-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