asyncrat | 1077acd7efd231e5852b8136197a35a570f4eb1a1d6abda44954003de48eb7b3

General

Target

Client.exe
Size

74KB
MD5

5fc0aa988d6e0a9c69dd4bf2c6b3eee2
SHA1

1820e65b8de60e17c9ce38bbda993260973eda0b
SHA256

1077acd7efd231e5852b8136197a35a570f4eb1a1d6abda44954003de48eb7b3
SHA512

91efeabac1e35719cbef3fe244a7555adf28896abe390623eb6faef060ea283ad2e285c494e00b3d1d5853a8a79b8b7c36258ad4d064082cc8ff2a1e25e3e4e0
SSDEEP

1536:9UzwcxbUTCrmPMVOe9VdQuDI6H1bf/HE6QzcSLVclN:9U0cxbgwmPMVOe9VdQsH1bfPFQDBY

Score

10^/10

asyncrat venomrat default rat

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet

Default

C2

127.0.0.1:9999

10.9.137.110:9999

Mutex

ytgjjhywchk

Attributes

delay
1
install
true
install_file
RealtekHighDefinitionAudio.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

VenomRAT 2 IoCs

Detects VenomRAT.

rat

resource	yara_rule
behavioral2/memory/2184-1-0x0000000000900000-0x0000000000918000-memory.dmp	VenomRAT
behavioral2/files/0x000b000000023b93-11.dat	VenomRAT

Venomrat family
venomrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x000b000000023b93-11.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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
4624	RealtekHighDefinitionAudio.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3012	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
3928	schtasks.exe

Suspicious behavior: EnumeratesProcesses 35 IoCs

pid	Process
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
2184	Client.exe
4624	RealtekHighDefinitionAudio.exe
4624	RealtekHighDefinitionAudio.exe
4624	RealtekHighDefinitionAudio.exe
4624	RealtekHighDefinitionAudio.exe
4624	RealtekHighDefinitionAudio.exe
4624	RealtekHighDefinitionAudio.exe
4624	RealtekHighDefinitionAudio.exe
4624	RealtekHighDefinitionAudio.exe
4624	RealtekHighDefinitionAudio.exe
4624	RealtekHighDefinitionAudio.exe
4624	RealtekHighDefinitionAudio.exe
4624	RealtekHighDefinitionAudio.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2184	Client.exe
Token: SeDebugPrivilege	4624	RealtekHighDefinitionAudio.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4624	RealtekHighDefinitionAudio.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2184 wrote to memory of 3776	2184	Client.exe	85
PID 2184 wrote to memory of 3776	2184	Client.exe	85
PID 2184 wrote to memory of 2216	2184	Client.exe	86
PID 2184 wrote to memory of 2216	2184	Client.exe	86
PID 2216 wrote to memory of 3012	2216	cmd.exe	89
PID 2216 wrote to memory of 3012	2216	cmd.exe	89
PID 3776 wrote to memory of 3928	3776	cmd.exe	90
PID 3776 wrote to memory of 3928	3776	cmd.exe	90
PID 2216 wrote to memory of 4624	2216	cmd.exe	91
PID 2216 wrote to memory of 4624	2216	cmd.exe	91

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Client.exe
"C:\Users\Admin\AppData\Local\Temp\Client.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2184
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "RealtekHighDefinitionAudio" /tr '"C:\Users\Admin\AppData\Roaming\RealtekHighDefinitionAudio.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3776
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "RealtekHighDefinitionAudio" /tr '"C:\Users\Admin\AppData\Roaming\RealtekHighDefinitionAudio.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3928
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBC2C.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2216
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3012
- - C:\Users\Admin\AppData\Roaming\RealtekHighDefinitionAudio.exe
    "C:\Users\Admin\AppData\Roaming\RealtekHighDefinitionAudio.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:4624

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmpBC2C.tmp.bat

Filesize
170B

MD5
e726e5904fd472e3c10a5719c820021e

SHA1
d2741dc4da862fecc176f7a3616f681b444f63b3

SHA256
e804fd8fef9e8dd8708a89b8bf8d88bfc4a0123b0fd1b4739d8181fb3f796ccc

SHA512
402ad6dced6df565953f41ee48bf65a33d77e6faecf2b721e0738f122f37890d1c3c669d0410ee02f552c9f91542a7e477f47fdc55c3d329ee1ef94e3e92d174

Download Submit
C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf

Filesize
8B

MD5
cf759e4c5f14fe3eec41b87ed756cea8

SHA1
c27c796bb3c2fac929359563676f4ba1ffada1f5

SHA256
c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761

SHA512
c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

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

Filesize
74KB

MD5
5fc0aa988d6e0a9c69dd4bf2c6b3eee2

SHA1
1820e65b8de60e17c9ce38bbda993260973eda0b

SHA256
1077acd7efd231e5852b8136197a35a570f4eb1a1d6abda44954003de48eb7b3

SHA512
91efeabac1e35719cbef3fe244a7555adf28896abe390623eb6faef060ea283ad2e285c494e00b3d1d5853a8a79b8b7c36258ad4d064082cc8ff2a1e25e3e4e0

Download Submit
memory/2184-0-0x00007FFF2B5F3000-0x00007FFF2B5F5000-memory.dmp

Filesize
8KB

Download
memory/2184-1-0x0000000000900000-0x0000000000918000-memory.dmp

Filesize
96KB

Download
memory/2184-3-0x00007FFF2B5F0000-0x00007FFF2C0B1000-memory.dmp

Filesize
10.8MB

Download
memory/2184-8-0x00007FFF2B5F0000-0x00007FFF2C0B1000-memory.dmp

Filesize
10.8MB

Download
memory/2184-9-0x00007FFF2B5F0000-0x00007FFF2C0B1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads