asyncrat | 760d61c1b76f9a909e2e427ed60c7cc76ebb32246b8aec5459d882a04482b1ea

General

Target

Client.exe
Size

47KB
MD5

304d41baaa716a6d582877785f93ef68
SHA1

a2b16217d6326c54fbd7ca5586519d50ce3e20ca
SHA256

760d61c1b76f9a909e2e427ed60c7cc76ebb32246b8aec5459d882a04482b1ea
SHA512

2a1f1859bf1ee1ff3be5469d44daf96ba8e6f26e377a6e538e64be815d4e7eb87911b0cbd2cddd3135c2f0e6933151fc47f8aeefa22e7becfa1babb8d38f3a41
SSDEEP

768:59n7mxUzILWCaS+Di1xCKzVixM8YbxgeXP9RavEgK/JXZVc6KN:597AKW1xCGLzb+SPTankJXZVclN

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

127.0.0.1:8848

127.0.0.1:16234

6.tcp.eu.ngrok.io:8848

6.tcp.eu.ngrok.io:16234

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
true
install_file
WindowsDefender.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/0x0007000000023214-9.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-1-5-21-1168293393-3419776239-306423207-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
3400	WindowsDefender.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
23	6.tcp.eu.ngrok.io
52	6.tcp.eu.ngrok.io

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
4912	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2236	timeout.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe
2948	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2948	Client.exe
Token: SeDebugPrivilege	3400	WindowsDefender.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2948 wrote to memory of 412	2948	Client.exe	83
PID 2948 wrote to memory of 412	2948	Client.exe	83
PID 2948 wrote to memory of 4988	2948	Client.exe	85
PID 2948 wrote to memory of 4988	2948	Client.exe	85
PID 4988 wrote to memory of 2236	4988	cmd.exe	87
PID 4988 wrote to memory of 2236	4988	cmd.exe	87
PID 412 wrote to memory of 4912	412	cmd.exe	88
PID 412 wrote to memory of 4912	412	cmd.exe	88
PID 4988 wrote to memory of 3400	4988	cmd.exe	89
PID 4988 wrote to memory of 3400	4988	cmd.exe	89

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:2948
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "WindowsDefender" /tr '"C:\Users\Admin\AppData\Roaming\WindowsDefender.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:412
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "WindowsDefender" /tr '"C:\Users\Admin\AppData\Roaming\WindowsDefender.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:4912
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp47E6.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4988
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2236
- - C:\Users\Admin\AppData\Roaming\WindowsDefender.exe
    "C:\Users\Admin\AppData\Roaming\WindowsDefender.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:3400

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp47E6.tmp.bat

Filesize
159B

MD5
e7620e8e620b3c63196e7247f73ff89c

SHA1
5ffce5ef7c078d3fac848dfb3408fcac8e5e73a3

SHA256
baf0f9eb70aa4672b34092a330ec4743123108331faaadf00fabad33b06cf632

SHA512
76f9e1097008cbf0104db74581e133ae450cc2b8d7bc2a933e27446572fafaecc4e8e9774c58db3ff16cf874bb6f9f75c3e9ab96946dd92444cb8ca217054eb0

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

Filesize
47KB

MD5
304d41baaa716a6d582877785f93ef68

SHA1
a2b16217d6326c54fbd7ca5586519d50ce3e20ca

SHA256
760d61c1b76f9a909e2e427ed60c7cc76ebb32246b8aec5459d882a04482b1ea

SHA512
2a1f1859bf1ee1ff3be5469d44daf96ba8e6f26e377a6e538e64be815d4e7eb87911b0cbd2cddd3135c2f0e6933151fc47f8aeefa22e7becfa1babb8d38f3a41

Download Submit
memory/2948-0-0x00000000003E0000-0x00000000003F2000-memory.dmp

Filesize
72KB

Download
memory/2948-1-0x00007FFDB2FF0000-0x00007FFDB3AB1000-memory.dmp

Filesize
10.8MB

Download
memory/2948-2-0x000000001B0E0000-0x000000001B0F0000-memory.dmp

Filesize
64KB

Download
memory/2948-7-0x00007FFDB2FF0000-0x00007FFDB3AB1000-memory.dmp

Filesize
10.8MB

Download
memory/3400-12-0x00007FFDB2FF0000-0x00007FFDB3AB1000-memory.dmp

Filesize
10.8MB

Download
memory/3400-13-0x000000001AF40000-0x000000001AF50000-memory.dmp

Filesize
64KB

Download
memory/3400-14-0x00007FFDB2FF0000-0x00007FFDB3AB1000-memory.dmp

Filesize
10.8MB

Download
memory/3400-15-0x000000001AF40000-0x000000001AF50000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads