asyncrat | f1d37a9a6cce462289e6677d69e9608820572350d732db4ddacf5f4bb53c1794

Analysis

max time kernel
18s
max time network
16s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
14-08-2024 02:12

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General

Target

Client.exe
Size

47KB
MD5

539ca8c5f34be270f01fefe8a24d0b22
SHA1

05a4b9d92658de4b9c5ef4ca8eefa2dfe8a60be6
SHA256

f1d37a9a6cce462289e6677d69e9608820572350d732db4ddacf5f4bb53c1794
SHA512

fab6f3e8114d4680d94e6e99fbc3de919a27d7160f48adbde459e75c889c3b01d3234f1514868af4af1cf541b451be7e6a260abc9ad40bfbed711aef0c729db8
SSDEEP

768:wC0aWbILWCaS+DiRtelDSN+iV08YbygeJge1ymvEgK/JnZVc6KN:wpaMWRtKDs4zb1RewmnkJnZVclN

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

127.0.0.1:8848

Mutex

DcRatMutex_qwqdanchun

Attributes

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

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x00090000000234b5-10.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-1-5-21-523280732-2327480845-3730041215-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
3580	Yes.exe

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

System Information Discovery
T1082

Checks SCSI registry key(s) 3 TTPs 3 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000	taskmgr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\Properties\{b725f130-47ef-101a-a5f1-02608c9eebac}\000A	taskmgr.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\FriendlyName	taskmgr.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3496	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
1776	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
4396	Client.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe
3580	Yes.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	4396	Client.exe
Token: SeDebugPrivilege	1772	taskmgr.exe
Token: SeSystemProfilePrivilege	1772	taskmgr.exe
Token: SeCreateGlobalPrivilege	1772	taskmgr.exe
Token: SeDebugPrivilege	3580	Yes.exe

Suspicious use of FindShellTrayWindow 13 IoCs

pid	Process
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe

Suspicious use of SendNotifyMessage 13 IoCs

pid	Process
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe
1772	taskmgr.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4396 wrote to memory of 368	4396	Client.exe	88
PID 4396 wrote to memory of 368	4396	Client.exe	88
PID 4396 wrote to memory of 3984	4396	Client.exe	90
PID 4396 wrote to memory of 3984	4396	Client.exe	90
PID 3984 wrote to memory of 3496	3984	cmd.exe	92
PID 3984 wrote to memory of 3496	3984	cmd.exe	92
PID 368 wrote to memory of 1776	368	cmd.exe	93
PID 368 wrote to memory of 1776	368	cmd.exe	93
PID 3984 wrote to memory of 3580	3984	cmd.exe	98
PID 3984 wrote to memory of 3580	3984	cmd.exe	98

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⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4396
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Yes" /tr '"C:\Users\Admin\AppData\Roaming\Yes.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:368
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Yes" /tr '"C:\Users\Admin\AppData\Roaming\Yes.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1776
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBD83.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3984
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3496
- - C:\Users\Admin\AppData\Roaming\Yes.exe
    "C:\Users\Admin\AppData\Roaming\Yes.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3580

C:\Windows\system32\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /4
1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:1772

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

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpBD83.tmp.bat

Filesize
147B

MD5
129e293374441ad963cac281f9e49c20

SHA1
bff79509e3c1bd1292f82e1428a6b9a31a199fed

SHA256
3840db17eb8c5c687b1d196d68905e747d33b9ead616f65aa04fc75b6707887b

SHA512
cf1a2cf821cd28295bc89c5eb2364955b3f172d4502f0cecccc266b6717e2802b85f52db2c0bb5312f8a1f41518c512e4acfabd78e875c1c73e84b6300369b65

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

Filesize
47KB

MD5
539ca8c5f34be270f01fefe8a24d0b22

SHA1
05a4b9d92658de4b9c5ef4ca8eefa2dfe8a60be6

SHA256
f1d37a9a6cce462289e6677d69e9608820572350d732db4ddacf5f4bb53c1794

SHA512
fab6f3e8114d4680d94e6e99fbc3de919a27d7160f48adbde459e75c889c3b01d3234f1514868af4af1cf541b451be7e6a260abc9ad40bfbed711aef0c729db8

Download Submit
memory/1772-13-0x000001A16BD90000-0x000001A16BD91000-memory.dmp

Filesize
4KB

Download
memory/1772-24-0x000001A16BD90000-0x000001A16BD91000-memory.dmp

Filesize
4KB

Download
memory/1772-18-0x000001A16BD90000-0x000001A16BD91000-memory.dmp

Filesize
4KB

Download
memory/1772-19-0x000001A16BD90000-0x000001A16BD91000-memory.dmp

Filesize
4KB

Download
memory/1772-12-0x000001A16BD90000-0x000001A16BD91000-memory.dmp

Filesize
4KB

Download
memory/1772-14-0x000001A16BD90000-0x000001A16BD91000-memory.dmp

Filesize
4KB

Download
memory/1772-20-0x000001A16BD90000-0x000001A16BD91000-memory.dmp

Filesize
4KB

Download
memory/1772-21-0x000001A16BD90000-0x000001A16BD91000-memory.dmp

Filesize
4KB

Download
memory/1772-23-0x000001A16BD90000-0x000001A16BD91000-memory.dmp

Filesize
4KB

Download
memory/1772-22-0x000001A16BD90000-0x000001A16BD91000-memory.dmp

Filesize
4KB

Download
memory/4396-7-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

Filesize
10.8MB

Download
memory/4396-0-0x00007FF90CC43000-0x00007FF90CC45000-memory.dmp

Filesize
8KB

Download
memory/4396-1-0x0000000000BE0000-0x0000000000BF2000-memory.dmp

Filesize
72KB

Download
memory/4396-2-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

Filesize
10.8MB

Download