asyncrat | b2f20f38ab8db652c4bde2249f32f5916f8376f882059d3d07a5cccf232b40e0

General

Target

Client1.exe
Size

48KB
MD5

bfd2e3a5b4e15ccd7dfd6b4911e3c7e4
SHA1

1396456c85cab058901217b31001b165992b3347
SHA256

b2f20f38ab8db652c4bde2249f32f5916f8376f882059d3d07a5cccf232b40e0
SHA512

6295ffb23980842fda55714db45a8ae71aa52c0bc76d33f28d5db9d6948f5d52a1970732551645eaccb02dc977c8b0ebd327b0d69c995922185e0c4a6d019a0c
SSDEEP

768:kBJmQiGybcILcGIl+jiPY/ah+diRi++98Ybnge4rvEgK/JHZVc6KN:kBigFeqXx+9zbgdrnkJHZVclN

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
true
install_file
apex.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/vtRDA9rk

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/0x000900000002346e-10.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-1-5-21-3881032017-2947584075-2120384563-1000\Control Panel\International\Geo\Nation	Client1.exe

Executes dropped EXE 1 IoCs

pid	Process
3352	apex.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs

Web Service

T1102

flow	ioc
2	pastebin.com
42	4.tcp.eu.ngrok.io
1	pastebin.com

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
4588	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
2000	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe
3120	Client1.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3120	Client1.exe
Token: SeDebugPrivilege	3352	apex.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3120 wrote to memory of 4852	3120	Client1.exe	81
PID 3120 wrote to memory of 4852	3120	Client1.exe	81
PID 3120 wrote to memory of 1040	3120	Client1.exe	83
PID 3120 wrote to memory of 1040	3120	Client1.exe	83
PID 1040 wrote to memory of 4588	1040	cmd.exe	85
PID 1040 wrote to memory of 4588	1040	cmd.exe	85
PID 4852 wrote to memory of 2000	4852	cmd.exe	86
PID 4852 wrote to memory of 2000	4852	cmd.exe	86
PID 1040 wrote to memory of 3352	1040	cmd.exe	87
PID 1040 wrote to memory of 3352	1040	cmd.exe	87

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\Client1.exe
"C:\Users\Admin\AppData\Local\Temp\Client1.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3120
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "apex" /tr '"C:\Users\Admin\AppData\Roaming\apex.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4852
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "apex" /tr '"C:\Users\Admin\AppData\Roaming\apex.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2000
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBB61.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1040
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4588
- - C:\Users\Admin\AppData\Roaming\apex.exe
    "C:\Users\Admin\AppData\Roaming\apex.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:3352

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpBB61.tmp.bat

Filesize
148B

MD5
7d7b030120262af3bd3ae7421302456e

SHA1
68ccf42c260355536ae80fcc0053bca1016ff900

SHA256
7080a4c6cf85dddb4e33d37e17e5e0f128817ce56f3f444615a02960d3a79322

SHA512
27705c462e4f81c3b657d5ad55a3fb85c59e527459f49c498afa35b8d6b1b33ab0c7ba2343820098e6855fb4a4f348436d2a34ffe0312cbb4c6aa76dd2b56b73

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

Filesize
48KB

MD5
bfd2e3a5b4e15ccd7dfd6b4911e3c7e4

SHA1
1396456c85cab058901217b31001b165992b3347

SHA256
b2f20f38ab8db652c4bde2249f32f5916f8376f882059d3d07a5cccf232b40e0

SHA512
6295ffb23980842fda55714db45a8ae71aa52c0bc76d33f28d5db9d6948f5d52a1970732551645eaccb02dc977c8b0ebd327b0d69c995922185e0c4a6d019a0c

Download Submit
memory/3120-0-0x0000000000910000-0x0000000000922000-memory.dmp

Filesize
72KB

Download
memory/3120-1-0x00007FFDCEF33000-0x00007FFDCEF35000-memory.dmp

Filesize
8KB

Download
memory/3120-2-0x00007FFDCEF30000-0x00007FFDCF9F1000-memory.dmp

Filesize
10.8MB

Download
memory/3120-7-0x00007FFDCEF30000-0x00007FFDCF9F1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads