asyncrat | f45c1e3804cb3db0debb4a9f77a86ca6fb8b8ae55b732d45ee7ac8e617568094

Resubmissions

09-05-2023 18:34

230509-w77spsfc6z 10

Analysis

max time kernel
29s
max time network
46s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
09-05-2023 18:34

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General

Target

CraxsRat v4/Crack.exe
Size

47KB
MD5

71499b2947646d03cf1f0addf810083e
SHA1

3d4d1e108ab43e0a6416bad34e3915e6e6a79873
SHA256

5a8e9e4691806bc732d2ac2dc4e1e1679f49ccf7c228d828dc329ffd85084512
SHA512

6fd9e8720a1be33b614cf2bdabdc813f5981f996187b6fb00be744d62a9d905d90bcab31e7f936f0d66eb60a9dea0d8c46e5a6d1475581b88e9606ffe2864b8f
SSDEEP

768:DeICljTILmCKi+DiBtelDSN+iV08Ybyge6D9KyvEgK/J3ZVc6KN:DeIYdmBtKDs4zb1P8ynkJ3ZVclN

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

description-lease.at.ply.gg:25727

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
true
install_file
Updates.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 3 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/3588-133-0x0000000000770000-0x0000000000782000-memory.dmp	asyncrat
C:\Users\Admin\AppData\Roaming\Updates.exe	asyncrat
C:\Users\Admin\AppData\Roaming\Updates.exe	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

Processes:

Crack.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Control Panel\International\Geo\Nation Crack.exe
Executes dropped EXE 1 IoCs

Processes:

Updates.exe

pid process

4260 Updates.exe
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
T1053

Processes:

schtasks.exe

pid process

2528 schtasks.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

212 timeout.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Control Panel\International\Geo\Nation	Crack.exe

pid	process
4260	Updates.exe

pid	process
2528	schtasks.exe

pid	process
212	timeout.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

Processes:

Crack.exe

pid	process
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe
3588	Crack.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Crack.exeUpdates.exe

description pid process

Token: SeDebugPrivilege 3588 Crack.exe
Token: SeDebugPrivilege 4260 Updates.exe

description	pid	process
Token: SeDebugPrivilege	3588	Crack.exe
Token: SeDebugPrivilege	4260	Updates.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

Crack.execmd.execmd.exe

description	pid	process	target process
PID 3588 wrote to memory of 1900	3588	Crack.exe	cmd.exe
PID 3588 wrote to memory of 1900	3588	Crack.exe	cmd.exe
PID 3588 wrote to memory of 3288	3588	Crack.exe	cmd.exe
PID 3588 wrote to memory of 3288	3588	Crack.exe	cmd.exe
PID 1900 wrote to memory of 2528	1900	cmd.exe	schtasks.exe
PID 1900 wrote to memory of 2528	1900	cmd.exe	schtasks.exe
PID 3288 wrote to memory of 212	3288	cmd.exe	timeout.exe
PID 3288 wrote to memory of 212	3288	cmd.exe	timeout.exe
PID 3288 wrote to memory of 4260	3288	cmd.exe	Updates.exe
PID 3288 wrote to memory of 4260	3288	cmd.exe	Updates.exe

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\CraxsRat v4\Crack.exe
"C:\Users\Admin\AppData\Local\Temp\CraxsRat v4\Crack.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3588

C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Updates" /tr '"C:\Users\Admin\AppData\Roaming\Updates.exe"' & exit
2⤵
- Suspicious use of WriteProcessMemory
PID:1900

C:\Windows\system32\schtasks.exe
schtasks /create /f /sc onlogon /rl highest /tn "Updates" /tr '"C:\Users\Admin\AppData\Roaming\Updates.exe"'
3⤵
- Creates scheduled task(s)
PID:2528

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAE27.tmp.bat""
2⤵
- Suspicious use of WriteProcessMemory
PID:3288

C:\Windows\system32\timeout.exe
timeout 3
3⤵
- Delays execution with timeout.exe
PID:212

C:\Users\Admin\AppData\Roaming\Updates.exe
"C:\Users\Admin\AppData\Roaming\Updates.exe"
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4260

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpAE27.tmp.bat
Filesize
151B

MD5
1116e778da1b5ac6272f2237f99274cf

SHA1
aeffa3b72d1bfabb3244365ce7484975178e4f42

SHA256
f4be819eeebfa351a98d79b01392077bbcc80bc45aae301486f681fc8194a939

SHA512
b3eead2a6484582e0c3e5af9037a7aab244e73ccd8ae10fea74eb18733c013466798e61144e28ba4d8e1a061676b8b274b4787ba82e441145fb6c8a768f3aa26

Download Submit
C:\Users\Admin\AppData\Roaming\Updates.exe
Filesize
47KB

MD5
71499b2947646d03cf1f0addf810083e

SHA1
3d4d1e108ab43e0a6416bad34e3915e6e6a79873

SHA256
5a8e9e4691806bc732d2ac2dc4e1e1679f49ccf7c228d828dc329ffd85084512

SHA512
6fd9e8720a1be33b614cf2bdabdc813f5981f996187b6fb00be744d62a9d905d90bcab31e7f936f0d66eb60a9dea0d8c46e5a6d1475581b88e9606ffe2864b8f

Download Submit
C:\Users\Admin\AppData\Roaming\Updates.exe
Filesize
47KB

MD5
71499b2947646d03cf1f0addf810083e

SHA1
3d4d1e108ab43e0a6416bad34e3915e6e6a79873

SHA256
5a8e9e4691806bc732d2ac2dc4e1e1679f49ccf7c228d828dc329ffd85084512

SHA512
6fd9e8720a1be33b614cf2bdabdc813f5981f996187b6fb00be744d62a9d905d90bcab31e7f936f0d66eb60a9dea0d8c46e5a6d1475581b88e9606ffe2864b8f

Download Submit
memory/3588-133-0x0000000000770000-0x0000000000782000-memory.dmp

Filesize
72KB

Download
memory/3588-134-0x000000001B480000-0x000000001B490000-memory.dmp

Filesize
64KB

Download
memory/4260-143-0x0000000002CB0000-0x0000000002CC0000-memory.dmp

Filesize
64KB

Download
memory/4260-144-0x0000000002CB0000-0x0000000002CC0000-memory.dmp

Filesize
64KB

Download