asyncrat | 1659db1c128cc72c1d5db8ec73a93cc89cc684f00a4c2b83b76fef32af45fe07

General

Target

PetSim99GUI.exe
Size

48KB
MD5

f5fa1fb705307bd25ca0d0408b8d6684
SHA1

31dffff48303612d94d4c10083ade7c6b3b777a3
SHA256

1659db1c128cc72c1d5db8ec73a93cc89cc684f00a4c2b83b76fef32af45fe07
SHA512

a2803bf7b0662893c1bbc5f2bf876690e57fbf611225cfd968cd04d9c3a005b3d71b27e2df8003ddfa2fcf353691957ea27b119dad88073f8adc9d5114abd246
SSDEEP

768:OugvNTjgkH7F7WUHF9pmo2q7cJ/IP8Xjog1VPI0HgmP0i0bc64EU7XoEFmSwBqRb:OugvNTcIb2te3gE0H6dbcjE+z5vdzH

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

letsgetdigging.hopto.org:6606

Mutex

gwp6EO1O6Isj

Attributes

delay
3
install
true
install_file
PS99.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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x000300000001e754-12.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-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	PetSim99GUI.exe

Executes dropped EXE 1 IoCs

pid	Process
2492	PS99.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PS99.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PetSim99GUI.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1612	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
2968	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe
4456	PetSim99GUI.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4456	PetSim99GUI.exe
Token: SeDebugPrivilege	2492	PS99.exe
Token: SeDebugPrivilege	2492	PS99.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4456 wrote to memory of 4012	4456	PetSim99GUI.exe	83
PID 4456 wrote to memory of 4012	4456	PetSim99GUI.exe	83
PID 4456 wrote to memory of 4012	4456	PetSim99GUI.exe	83
PID 4456 wrote to memory of 4944	4456	PetSim99GUI.exe	85
PID 4456 wrote to memory of 4944	4456	PetSim99GUI.exe	85
PID 4456 wrote to memory of 4944	4456	PetSim99GUI.exe	85
PID 4012 wrote to memory of 2968	4012	cmd.exe	87
PID 4012 wrote to memory of 2968	4012	cmd.exe	87
PID 4012 wrote to memory of 2968	4012	cmd.exe	87
PID 4944 wrote to memory of 1612	4944	cmd.exe	88
PID 4944 wrote to memory of 1612	4944	cmd.exe	88
PID 4944 wrote to memory of 1612	4944	cmd.exe	88
PID 4944 wrote to memory of 2492	4944	cmd.exe	92
PID 4944 wrote to memory of 2492	4944	cmd.exe	92
PID 4944 wrote to memory of 2492	4944	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\PetSim99GUI.exe
"C:\Users\Admin\AppData\Local\Temp\PetSim99GUI.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4456
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "PS99" /tr '"C:\Users\Admin\AppData\Roaming\PS99.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4012
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "PS99" /tr '"C:\Users\Admin\AppData\Roaming\PS99.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2968
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp395D.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4944
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1612
- - C:\Users\Admin\AppData\Roaming\PS99.exe
    "C:\Users\Admin\AppData\Roaming\PS99.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2492

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\tmp395D.tmp.bat

Filesize
148B

MD5
17a1c8f8657670121327cc19ccad1868

SHA1
3bcec43d98dfc0bf4e4800468fb1aed7b1f9d364

SHA256
21d4ebd979419dbe8e32b9b8f3c325671cc1342d67fc7a3dc462d5fccf5cdebf

SHA512
236d53f1d1d0c21831359f250ffc97fd784896f5d5cd3772a73fc1d1dfcf3dbd7477af1a9ecf23920438bbbcad1c8b91d107912168720304008b55b3b3a33487

Download Submit
C:\Users\Admin\AppData\Roaming\PS99.exe

Filesize
48KB

MD5
f5fa1fb705307bd25ca0d0408b8d6684

SHA1
31dffff48303612d94d4c10083ade7c6b3b777a3

SHA256
1659db1c128cc72c1d5db8ec73a93cc89cc684f00a4c2b83b76fef32af45fe07

SHA512
a2803bf7b0662893c1bbc5f2bf876690e57fbf611225cfd968cd04d9c3a005b3d71b27e2df8003ddfa2fcf353691957ea27b119dad88073f8adc9d5114abd246

Download Submit
memory/2492-14-0x00000000749B0000-0x0000000075160000-memory.dmp

Filesize
7.7MB

Download
memory/2492-17-0x0000000005F10000-0x00000000064B4000-memory.dmp

Filesize
5.6MB

Download
memory/2492-18-0x00000000749B0000-0x0000000075160000-memory.dmp

Filesize
7.7MB

Download
memory/4456-0-0x0000000074A6E000-0x0000000074A6F000-memory.dmp

Filesize
4KB

Download
memory/4456-1-0x0000000000420000-0x0000000000432000-memory.dmp

Filesize
72KB

Download
memory/4456-2-0x0000000074A60000-0x0000000075210000-memory.dmp

Filesize
7.7MB

Download
memory/4456-3-0x0000000004DB0000-0x0000000004E16000-memory.dmp

Filesize
408KB

Download
memory/4456-4-0x0000000005290000-0x000000000532C000-memory.dmp

Filesize
624KB

Download
memory/4456-9-0x0000000074A60000-0x0000000075210000-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