asyncrat | 1ab7fef81e4a5325f70a7eb8f1e551edaa6344d16eb1aeca68974d89bb4e40db

Resubmissions

11/03/2025, 16:25

250311-txbamsxq12 10

10/03/2025, 16:59

250310-vhtzwastaz 10

Analysis

max time kernel
39s
max time network
49s
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/chrome.exe
Size

48KB
MD5

560316acf1e4be6ee63f609da37e71b5
SHA1

5f22dcf7736356e24b92397162acb723010914fb
SHA256

44d97fbdb694ca55e3beec4ec031ef5162018bdbaff6a968ac25a21e078511b0
SHA512

38d185d48cf537162ef8302df31cdf723d7407765f21284492345cae914d38ec9e3a6cfee0080b5ff9ebef29f7ac54a505ea2e6fea5d65a60c4e6e1e67fb3361
SSDEEP

768:+BUQgNIL4+M0+LiPLKjwiT8Ybrge09FvEgK/Jw8Vc6KN:+B1gjsPLKTzbUxznkJw8VclN

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
behavioral5/files/0x000d000000027c4b-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-1-5-21-2501448743-3279416841-701563739-1000\Control Panel\International\Geo\Nation	chrome.exe

Executes dropped EXE 1 IoCs

pid	Process
1340	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
4044	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
444	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe
1724	chrome.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1724	chrome.exe
Token: SeDebugPrivilege	1340	Chrome.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1724 wrote to memory of 4848	1724	chrome.exe	84
PID 1724 wrote to memory of 4848	1724	chrome.exe	84
PID 1724 wrote to memory of 3992	1724	chrome.exe	86
PID 1724 wrote to memory of 3992	1724	chrome.exe	86
PID 4848 wrote to memory of 444	4848	cmd.exe	88
PID 4848 wrote to memory of 444	4848	cmd.exe	88
PID 3992 wrote to memory of 4044	3992	cmd.exe	89
PID 3992 wrote to memory of 4044	3992	cmd.exe	89
PID 3992 wrote to memory of 1340	3992	cmd.exe	92
PID 3992 wrote to memory of 1340	3992	cmd.exe	92

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\chrome.exe
"C:\Users\Admin\AppData\Local\Temp\cdnmain\chrome.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1724
- 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
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4848
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Chrome" /tr '"C:\Users\Admin\AppData\Roaming\Chrome.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:444
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp901A.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3992
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4044
- - C:\Users\Admin\AppData\Roaming\Chrome.exe
    "C:\Users\Admin\AppData\Roaming\Chrome.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:1340

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\tmp901A.tmp.bat

Filesize
150B

MD5
eba00d08e792dc34afc75d53942d590e

SHA1
a3552737a9b1f28adcf228a7853450f75ef07018

SHA256
8758046bad501bd0f0086c31829b6b983d5004152308b8bfd63357ad16d5208e

SHA512
f35a432b8f8394b87e93314636650639dacae23799a5fed5e899fc9a5aac479cec33ef81b45f78697c8cc47dd10f138a86ebe0065d0eb93f6b738eed287657fb

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

Filesize
48KB

MD5
560316acf1e4be6ee63f609da37e71b5

SHA1
5f22dcf7736356e24b92397162acb723010914fb

SHA256
44d97fbdb694ca55e3beec4ec031ef5162018bdbaff6a968ac25a21e078511b0

SHA512
38d185d48cf537162ef8302df31cdf723d7407765f21284492345cae914d38ec9e3a6cfee0080b5ff9ebef29f7ac54a505ea2e6fea5d65a60c4e6e1e67fb3361

Download Submit
memory/1724-0-0x00007FFC580B3000-0x00007FFC580B5000-memory.dmp

Filesize
8KB

Download
memory/1724-1-0x0000000000C90000-0x0000000000CA2000-memory.dmp

Filesize
72KB

Download
memory/1724-2-0x00007FFC580B0000-0x00007FFC58B72000-memory.dmp

Filesize
10.8MB

Download
memory/1724-7-0x00007FFC580B0000-0x00007FFC58B72000-memory.dmp

Filesize
10.8MB

Download