asyncrat | 1ab7fef81e4a5325f70a7eb8f1e551edaa6344d16eb1aeca68974d89bb4e40db

Resubmissions

11/03/2025, 16:25

250311-txbamsxq12 10

10/03/2025, 16:59

250310-vhtzwastaz 10

Analysis

max time kernel
111s
max time network
120s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20250217-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250217-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
10/03/2025, 16:59

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General

Target

cdnmain/ef.exe
Size

54KB
MD5

0ed9406036832e40f6ace06478acdf44
SHA1

9a3ca883ec34bdfd1c21c61c6ca6d03c5365fa6e
SHA256

452e3305df1bf06c79301b9b87de1ec82561a793c4ef4ea5a02803123891b9f6
SHA512

9de32c71a4657d3e9ebd01fd1d933fd44b23c99809bbd0c8c423dcf8436d8c3f81e390ec34df8fb2e5a3a28974c864750ceaeb65693c04b1c5a1f8134eca69a5
SSDEEP

1536:de/mS9oEXN9p7aNJahXy4zGuH4XlqJaAIT+7bqhyX9qZ:d+mSawsLawqGMolq07i7bqMX9W

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

2.58.56.179:2035

Mutex

r4ttlesn4ke_ufog3f8u3egef978

Attributes

delay
1
install
true
install_file
Chrome.exe
install_folder
%AppData%

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
behavioral9/files/0x000c000000027d99-8.dat	family_asyncrat

Checks computer location settings 2 TTPs 2 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-1-5-21-1095212214-1383118828-1037266802-1000\Control Panel\International\Geo\Nation	ef.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1095212214-1383118828-1037266802-1000\Control Panel\International\Geo\Nation	chrome.exe

Executes dropped EXE 2 IoCs

pid	Process
4556	chrome.exe
4292	Chrome.exe

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
3184	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
4144	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe
4556	chrome.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4556	chrome.exe
Token: SeDebugPrivilege	4292	Chrome.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2352 wrote to memory of 4556	2352	ef.exe	80
PID 2352 wrote to memory of 4556	2352	ef.exe	80
PID 4556 wrote to memory of 812	4556	chrome.exe	81
PID 4556 wrote to memory of 812	4556	chrome.exe	81
PID 4556 wrote to memory of 4580	4556	chrome.exe	83
PID 4556 wrote to memory of 4580	4556	chrome.exe	83
PID 812 wrote to memory of 4144	812	cmd.exe	85
PID 812 wrote to memory of 4144	812	cmd.exe	85
PID 4580 wrote to memory of 3184	4580	cmd.exe	86
PID 4580 wrote to memory of 3184	4580	cmd.exe	86
PID 4580 wrote to memory of 4292	4580	cmd.exe	87
PID 4580 wrote to memory of 4292	4580	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\cdnmain\ef.exe
"C:\Users\Admin\AppData\Local\Temp\cdnmain\ef.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2352
- C:\Users\Admin\AppData\Local\Temp\chrome.exe
  "C:\Users\Admin\AppData\Local\Temp\chrome.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4556
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Chrome" /tr '"C:\Users\Admin\AppData\Roaming\Chrome.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:812
  - - C:\Windows\system32\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "Chrome" /tr '"C:\Users\Admin\AppData\Roaming\Chrome.exe"'
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4144
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp1F0C.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4580
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:3184
  - - C:\Users\Admin\AppData\Roaming\Chrome.exe
      "C:\Users\Admin\AppData\Roaming\Chrome.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      PID:4292

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

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Chrome.exe.log

Filesize
425B

MD5
822f6384df6d1671168631e912dd7a4c

SHA1
972aacac112d14ea63c9d33b57ecd402e67a5f19

SHA256
5f50faf2e5bbac2ce5423530952c977e965d60dfb6920a5cce5a707bac630bc4

SHA512
3c03b3c90b551c7febce56406b48e5e4022e7128bfd3a283ec0e3dd952575649af3428b514fb8a312358eb643d3a4f3f4f747a16c29b8863f5367fffe11a9fbf

Download Submit
C:\Users\Admin\AppData\Local\Temp\chrome.exe

Filesize
48KB

MD5
560316acf1e4be6ee63f609da37e71b5

SHA1
5f22dcf7736356e24b92397162acb723010914fb

SHA256
44d97fbdb694ca55e3beec4ec031ef5162018bdbaff6a968ac25a21e078511b0

SHA512
38d185d48cf537162ef8302df31cdf723d7407765f21284492345cae914d38ec9e3a6cfee0080b5ff9ebef29f7ac54a505ea2e6fea5d65a60c4e6e1e67fb3361

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp1F0C.tmp.bat

Filesize
150B

MD5
a6784cdb819521a8f09055a3d544342e

SHA1
febac57d8d113ed844a146b00c920d0765102c1f

SHA256
624234f636796229fa42dcf9a35cea3558451d81bab89ee28aa4a4964d2242e4

SHA512
d9c09df4b0d2a3d5488d6e40af091084bad46c090602bcbba00d6a05b93bef10f13f0a95c8a3174fa9b3e485a6cfabe65edec68493d1de6c41a0b3017e16511b

Download Submit
memory/2352-0-0x00007FFAA3F73000-0x00007FFAA3F75000-memory.dmp

Filesize
8KB

Download
memory/2352-1-0x0000000000E90000-0x0000000000EA4000-memory.dmp

Filesize
80KB

Download
memory/2352-3-0x00007FFAA3F70000-0x00007FFAA4A32000-memory.dmp

Filesize
10.8MB

Download
memory/2352-20-0x00007FFAA3F70000-0x00007FFAA4A32000-memory.dmp

Filesize
10.8MB

Download
memory/4556-18-0x0000000000870000-0x0000000000882000-memory.dmp

Filesize
72KB

Download
memory/4556-19-0x00007FFAA3F70000-0x00007FFAA4A32000-memory.dmp

Filesize
10.8MB

Download
memory/4556-21-0x00007FFAA3F70000-0x00007FFAA4A32000-memory.dmp

Filesize
10.8MB

Download
memory/4556-26-0x00007FFAA3F70000-0x00007FFAA4A32000-memory.dmp

Filesize
10.8MB

Download