asyncrat | 61872ee6c75b35f80c3279c549d9d3457fb2557166f2628716ee41e36c03f92c

Analysis

max time kernel
299s
max time network
301s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
30/01/2025, 23:14

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General

Target

AsyncClient.exe
Size

47KB
MD5

f06fbe928d0b97d4aacb1370a258ffb5
SHA1

f2d4ca100ae403557d209ca467fa07179802df09
SHA256

61872ee6c75b35f80c3279c549d9d3457fb2557166f2628716ee41e36c03f92c
SHA512

cd2afec901a8aa643ef4448c814704d5928e6975e547c0af0b366e4855b01e551d191f8dffe1b3b86a424a7e0d308cc0303bf3418358696cba6c74e160497cba
SSDEEP

768:wued1TYQZ3VWU1ymhbvmo2qjB4gNaoGGPIzsKZuEK/qR/7Yb8qDdXUVgLZc1yq+4:wued1TYiFhN2poGvJZuEK/kkb8udEWOb

Score

10^/10

asyncrat winscript discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

WinScript

Mutex

WmNVpZFGaUkb

Attributes

delay
3
install
true
install_file
winscript.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/MWg2CxEm

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
behavioral2/files/0x001a00000002aafd-11.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
3836	winscript.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 57 IoCs

Web Service

T1102

flow	ioc
35	pastebin.com
37	pastebin.com
48	pastebin.com
11	pastebin.com
32	pastebin.com
51	pastebin.com
53	pastebin.com
2	pastebin.com
13	pastebin.com
36	pastebin.com
47	pastebin.com
49	pastebin.com
20	pastebin.com
54	pastebin.com
5	pastebin.com
9	pastebin.com
22	pastebin.com
27	pastebin.com
39	pastebin.com
46	pastebin.com
56	pastebin.com
59	pastebin.com
12	pastebin.com
40	pastebin.com
50	pastebin.com
6	pastebin.com
23	pastebin.com
25	pastebin.com
58	pastebin.com
17	pastebin.com
34	pastebin.com
38	pastebin.com
4	pastebin.com
10	pastebin.com
26	pastebin.com
29	pastebin.com
15	pastebin.com
21	pastebin.com
31	pastebin.com
57	pastebin.com
16	pastebin.com
30	pastebin.com
33	pastebin.com
52	pastebin.com
1	pastebin.com
8	pastebin.com
19	pastebin.com
42	pastebin.com
43	pastebin.com
7	pastebin.com
14	pastebin.com
28	pastebin.com
55	pastebin.com
24	pastebin.com
45	pastebin.com
41	pastebin.com
44	pastebin.com

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	winscript.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1972	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
4360	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe
4820	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4820	AsyncClient.exe
Token: SeDebugPrivilege	3836	winscript.exe
Token: SeDebugPrivilege	3836	winscript.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4820 wrote to memory of 3892	4820	AsyncClient.exe	79
PID 4820 wrote to memory of 3892	4820	AsyncClient.exe	79
PID 4820 wrote to memory of 3892	4820	AsyncClient.exe	79
PID 4820 wrote to memory of 4224	4820	AsyncClient.exe	81
PID 4820 wrote to memory of 4224	4820	AsyncClient.exe	81
PID 4820 wrote to memory of 4224	4820	AsyncClient.exe	81
PID 4224 wrote to memory of 1972	4224	cmd.exe	83
PID 4224 wrote to memory of 1972	4224	cmd.exe	83
PID 4224 wrote to memory of 1972	4224	cmd.exe	83
PID 3892 wrote to memory of 4360	3892	cmd.exe	84
PID 3892 wrote to memory of 4360	3892	cmd.exe	84
PID 3892 wrote to memory of 4360	3892	cmd.exe	84
PID 4224 wrote to memory of 3836	4224	cmd.exe	85
PID 4224 wrote to memory of 3836	4224	cmd.exe	85
PID 4224 wrote to memory of 3836	4224	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4820
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "winscript" /tr '"C:\Users\Admin\AppData\Roaming\winscript.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3892
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "winscript" /tr '"C:\Users\Admin\AppData\Roaming\winscript.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4360
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8FEC.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4224
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1972
- - C:\Users\Admin\AppData\Roaming\winscript.exe
    "C:\Users\Admin\AppData\Roaming\winscript.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:3836

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp8FEC.tmp.bat

Filesize
153B

MD5
d8e4a52f9fcbab19d4aabe763bb52e7e

SHA1
72653d2c5fcbf40c06111a34c3841a65fd79eb77

SHA256
e1831cd6ac7c24744916f96c9f2b98cc5f1cd915778ad9fc247e6dc00e6fa910

SHA512
0308e297e92bdd1808146d5d52c25e5c0ec0b65436add5b824f04ef837a4bda38719987e38fd9f329116425a2d03e98453d1d1dcf30c515f050c7abec1c73c5c

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

Filesize
47KB

MD5
f06fbe928d0b97d4aacb1370a258ffb5

SHA1
f2d4ca100ae403557d209ca467fa07179802df09

SHA256
61872ee6c75b35f80c3279c549d9d3457fb2557166f2628716ee41e36c03f92c

SHA512
cd2afec901a8aa643ef4448c814704d5928e6975e547c0af0b366e4855b01e551d191f8dffe1b3b86a424a7e0d308cc0303bf3418358696cba6c74e160497cba

Download Submit
memory/3836-13-0x0000000074550000-0x0000000074D01000-memory.dmp

Filesize
7.7MB

Download
memory/3836-14-0x0000000074550000-0x0000000074D01000-memory.dmp

Filesize
7.7MB

Download
memory/4820-0-0x00000000745FE000-0x00000000745FF000-memory.dmp

Filesize
4KB

Download
memory/4820-1-0x0000000000B20000-0x0000000000B32000-memory.dmp

Filesize
72KB

Download
memory/4820-2-0x00000000745F0000-0x0000000074DA1000-memory.dmp

Filesize
7.7MB

Download
memory/4820-3-0x00000000055A0000-0x000000000563C000-memory.dmp

Filesize
624KB

Download
memory/4820-9-0x00000000745F0000-0x0000000074DA1000-memory.dmp

Filesize
7.7MB

Download