asyncrat | fe0f056142303bda8538355d81aced08b4792c9787c6060ccad08442e0dacad0 | Triage

Analysis

max time kernel
148s
max time network
149s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
30/01/2025, 12:49

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General

Target

winjs.exe
Size

52KB
MD5

623a97bc746f3b530b9f2cb2df7e9145
SHA1

1c03bf8e9db2120a1473c9c6924059e75639fa1c
SHA256

fe0f056142303bda8538355d81aced08b4792c9787c6060ccad08442e0dacad0
SHA512

c0b89b096704a2727bf0242b2d20ed563980e51c4535cac98a9a34d84e89289bda87e3763bedb615f04f72d18a502f48b8ad5276c9e8dc4d1373e1a0bd47ff52
SSDEEP

768:YoGDMmILyCe++bidiEuiso8Ybwge9V2COvEgK/Jn2i++++tyVc6KN:Yo0MWSMEzb3mOnkJLyVclN

Score

10^/10

asyncrat powershell rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

PowerShell

Mutex

DCSSZZVV

Attributes

delay
1
install
true
install_file
winws.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/cn4rM5C9

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

resource	yara_rule
behavioral2/files/0x000a00000001227e-15.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2752	winws.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 28 IoCs

Web Service

flow	ioc
10	pastebin.com
24	pastebin.com
30	pastebin.com
7	pastebin.com
13	pastebin.com
23	pastebin.com
27	pastebin.com
28	pastebin.com
29	pastebin.com
31	pastebin.com
5	pastebin.com
12	pastebin.com
16	pastebin.com
21	pastebin.com
11	pastebin.com
20	pastebin.com
22	pastebin.com
26	pastebin.com
15	pastebin.com
19	pastebin.com
25	pastebin.com
6	pastebin.com
9	pastebin.com
17	pastebin.com
4	pastebin.com
18	pastebin.com
14	pastebin.com
8	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

defense_evasion

pid	Process
1876	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

pid	Process
2892	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2408	winjs.exe
2408	winjs.exe
2408	winjs.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2408	winjs.exe
Token: SeDebugPrivilege	2408	winjs.exe
Token: SeDebugPrivilege	2752	winws.exe
Token: SeDebugPrivilege	2752	winws.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2408 wrote to memory of 1228	2408	winjs.exe	30
PID 2408 wrote to memory of 1228	2408	winjs.exe	30
PID 2408 wrote to memory of 1228	2408	winjs.exe	30
PID 2408 wrote to memory of 2176	2408	winjs.exe	32
PID 2408 wrote to memory of 2176	2408	winjs.exe	32
PID 2408 wrote to memory of 2176	2408	winjs.exe	32
PID 2176 wrote to memory of 1876	2176	cmd.exe	34
PID 2176 wrote to memory of 1876	2176	cmd.exe	34
PID 2176 wrote to memory of 1876	2176	cmd.exe	34
PID 1228 wrote to memory of 2892	1228	cmd.exe	35
PID 1228 wrote to memory of 2892	1228	cmd.exe	35
PID 1228 wrote to memory of 2892	1228	cmd.exe	35
PID 2176 wrote to memory of 2752	2176	cmd.exe	37
PID 2176 wrote to memory of 2752	2176	cmd.exe	37
PID 2176 wrote to memory of 2752	2176	cmd.exe	37

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\winjs.exe
"C:\Users\Admin\AppData\Local\Temp\winjs.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2408
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "winws" /tr '"C:\Users\Admin\AppData\Roaming\winws.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1228
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "winws" /tr '"C:\Users\Admin\AppData\Roaming\winws.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2892
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpC735.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2176
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1876
- - C:\Users\Admin\AppData\Roaming\winws.exe
    "C:\Users\Admin\AppData\Roaming\winws.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:2752

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Scheduled Task/Job

Scheduled Task

Defense Evasion

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Web Service

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpC735.tmp.bat

Filesize
149B

MD5
80f8f4273c59f172766260c46ecb74e1

SHA1
512351298dd78b1ab723739a337023637d0e19c3

SHA256
086a65dbd217127a41b2e73e8ebcb247b049783e5ac60c045c78eced4f1fded2

SHA512
48171e76c000823b19f5e84db6c89986c6d51344dd3fb8696e74aad0e04a5d6713727b1b937a0880c1ac4dce74a8856b2280276a340243a290aed0e00e81f282

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

Filesize
52KB

MD5
623a97bc746f3b530b9f2cb2df7e9145

SHA1
1c03bf8e9db2120a1473c9c6924059e75639fa1c

SHA256
fe0f056142303bda8538355d81aced08b4792c9787c6060ccad08442e0dacad0

SHA512
c0b89b096704a2727bf0242b2d20ed563980e51c4535cac98a9a34d84e89289bda87e3763bedb615f04f72d18a502f48b8ad5276c9e8dc4d1373e1a0bd47ff52

Download Submit
memory/2408-0-0x000007FEF62E3000-0x000007FEF62E4000-memory.dmp

Filesize
4KB

Download
memory/2408-1-0x0000000001010000-0x0000000001024000-memory.dmp

Filesize
80KB

Download
memory/2408-2-0x000007FEF62E0000-0x000007FEF6CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2408-12-0x000007FEF62E0000-0x000007FEF6CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2752-16-0x0000000000E80000-0x0000000000E94000-memory.dmp

Filesize
80KB

Download