asyncrat | 7d7fefea4821294e42f1848ec0d0512398d53d75fad6130cf7d47384378d7bca

General

Target

Client.exe
Size

48KB
MD5

c455e1785b15f7ab254cfc3418803921
SHA1

9164b636c9e11d1060009de5100a6b60e5f37837
SHA256

7d7fefea4821294e42f1848ec0d0512398d53d75fad6130cf7d47384378d7bca
SHA512

0b3acca31da5d6a477ecf36b4a97d2c2e76fae7b6663024222934304da46043a93ddead5551c402d47d709b89854f8d66b807f3f8d52911be3bfc5e26ef4eb2d
SSDEEP

768:AWgtBBILDmY1+Vxi4telDSN+iV08YbygetBrUyvvEgK/JkEVc6KN:ADak84tKDs4zb1wB4yvnkJkEVclN

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
GoogleUpdate.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/rN9BXgA1

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
behavioral1/files/0x00080000000120f9-14.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2824	GoogleUpdate.exe

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

Web Service

T1102

flow	ioc
4	pastebin.com
5	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
1912	timeout.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1608	taskkill.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
1272	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2020	Client.exe
2020	Client.exe
2020	Client.exe
2824	GoogleUpdate.exe
2824	GoogleUpdate.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2020	Client.exe
Token: SeDebugPrivilege	2020	Client.exe
Token: SeDebugPrivilege	2824	GoogleUpdate.exe
Token: SeDebugPrivilege	2824	GoogleUpdate.exe
Token: SeDebugPrivilege	1608	taskkill.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2020 wrote to memory of 1984	2020	Client.exe	30
PID 2020 wrote to memory of 1984	2020	Client.exe	30
PID 2020 wrote to memory of 1984	2020	Client.exe	30
PID 2020 wrote to memory of 1648	2020	Client.exe	32
PID 2020 wrote to memory of 1648	2020	Client.exe	32
PID 2020 wrote to memory of 1648	2020	Client.exe	32
PID 1648 wrote to memory of 1912	1648	cmd.exe	34
PID 1648 wrote to memory of 1912	1648	cmd.exe	34
PID 1648 wrote to memory of 1912	1648	cmd.exe	34
PID 1984 wrote to memory of 1272	1984	cmd.exe	35
PID 1984 wrote to memory of 1272	1984	cmd.exe	35
PID 1984 wrote to memory of 1272	1984	cmd.exe	35
PID 1648 wrote to memory of 2824	1648	cmd.exe	37
PID 1648 wrote to memory of 2824	1648	cmd.exe	37
PID 1648 wrote to memory of 2824	1648	cmd.exe	37
PID 2824 wrote to memory of 2600	2824	GoogleUpdate.exe	39
PID 2824 wrote to memory of 2600	2824	GoogleUpdate.exe	39
PID 2824 wrote to memory of 2600	2824	GoogleUpdate.exe	39
PID 2824 wrote to memory of 2880	2824	GoogleUpdate.exe	41
PID 2824 wrote to memory of 2880	2824	GoogleUpdate.exe	41
PID 2824 wrote to memory of 2880	2824	GoogleUpdate.exe	41
PID 2880 wrote to memory of 1608	2880	cmd.exe	43
PID 2880 wrote to memory of 1608	2880	cmd.exe	43
PID 2880 wrote to memory of 1608	2880	cmd.exe	43

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⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2020
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "GoogleUpdate" /tr '"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1984
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "GoogleUpdate" /tr '"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1272
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpC9C5.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1648
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1912
- - C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
    "C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2824
  - - C:\Windows\system32\cmd.exe
      "cmd"
      4⤵
      PID:2600
  - - C:\Windows\system32\cmd.exe
      "cmd"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2880
    - - C:\Windows\system32\taskkill.exe
        
        taskkill /f /im svchost.exe
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:1608

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

1

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\Cab8D44.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar1AD6.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC9C5.tmp.bat

Filesize
156B

MD5
c478ae11adfe312c8466253cadeff173

SHA1
8b5bc6f808e01fe3b42203f98ce413d4db76b9b7

SHA256
75cf11c3381f51b4ade61617668fdb7328e3faac2ad4ef4f9888d25748d87594

SHA512
4da9df658f1b55d16bff12107a374713d6c40c093989b7ec1b8388257b221df199df0921c26a1a0dbe09d3d1f9d89f340cc81cf9e664c81f6fe6707e5a4cc641

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

Filesize
48KB

MD5
c455e1785b15f7ab254cfc3418803921

SHA1
9164b636c9e11d1060009de5100a6b60e5f37837

SHA256
7d7fefea4821294e42f1848ec0d0512398d53d75fad6130cf7d47384378d7bca

SHA512
0b3acca31da5d6a477ecf36b4a97d2c2e76fae7b6663024222934304da46043a93ddead5551c402d47d709b89854f8d66b807f3f8d52911be3bfc5e26ef4eb2d

Download Submit
memory/2020-0-0x000007FEF55B3000-0x000007FEF55B4000-memory.dmp

Filesize
4KB

Download
memory/2020-1-0x0000000001180000-0x0000000001192000-memory.dmp

Filesize
72KB

Download
memory/2020-2-0x000007FEF55B0000-0x000007FEF5F9C000-memory.dmp

Filesize
9.9MB

Download
memory/2020-12-0x000007FEF55B0000-0x000007FEF5F9C000-memory.dmp

Filesize
9.9MB

Download
memory/2824-16-0x0000000000A50000-0x0000000000A62000-memory.dmp

Filesize
72KB

Download
memory/2824-34-0x0000000000A20000-0x0000000000A30000-memory.dmp

Filesize
64KB

Download
memory/2824-71-0x0000000002010000-0x000000000202A000-memory.dmp

Filesize
104KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads