asyncrat | 929bd74e00c56ec0935d5390a89dd4942abc1f3511a267034739fff0491e350b | Triage

Analysis

max time kernel
143s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
07-12-2024 14:44

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General

Target

3.exe
Size

48KB
MD5

3d9e11f133404b0de3f4fd7e375e3fbf
SHA1

1da48c172f95eb337a3b3427f6360d112abf907e
SHA256

929bd74e00c56ec0935d5390a89dd4942abc1f3511a267034739fff0491e350b
SHA512

77aa948b664f957851bb33d2276df7315d5f05abe912bed1214f6e37270a525799fb04cacd0e17a6c07fff55f96a32222ecf71fcf2104e71de153c64de8f147c
SSDEEP

768:eVVFxILHtFp+BirI7Vf2ki6Y8Yb4gepge+6BvEgK/JYZVc6KN:eV27Eorzbvt6BnkJYZVclN

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

127.0.0.1:8848

127.0.0.1:52039

dfsgmnhsrf23456623423456-52039.portmap.host:8848

dfsgmnhsrf23456623423456-52039.portmap.host:52039

Mutex

DcRatMutex_qwqdanchunxinsfd,mhbm gdfvg

Attributes

delay
1
install
true
install_file
windows defender firewall required.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

resource	yara_rule
behavioral2/files/0x0008000000023c9b-10.dat	family_asyncrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	3.exe

Executes dropped EXE 1 IoCs

pid	Process
3488	windows defender firewall required.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

pid	Process
2024	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
2180	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe
3272	3.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3272	3.exe
Token: SeDebugPrivilege	3488	windows defender firewall required.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3272 wrote to memory of 2456	3272	3.exe	82
PID 3272 wrote to memory of 2456	3272	3.exe	82
PID 3272 wrote to memory of 4424	3272	3.exe	84
PID 3272 wrote to memory of 4424	3272	3.exe	84
PID 2456 wrote to memory of 2180	2456	cmd.exe	86
PID 2456 wrote to memory of 2180	2456	cmd.exe	86
PID 4424 wrote to memory of 2024	4424	cmd.exe	87
PID 4424 wrote to memory of 2024	4424	cmd.exe	87
PID 4424 wrote to memory of 3488	4424	cmd.exe	88
PID 4424 wrote to memory of 3488	4424	cmd.exe	88

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\3.exe
"C:\Users\Admin\AppData\Local\Temp\3.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3272
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "windows defender firewall required" /tr '"C:\Users\Admin\AppData\Roaming\windows defender firewall required.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2456
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "windows defender firewall required" /tr '"C:\Users\Admin\AppData\Roaming\windows defender firewall required.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2180
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAEED.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4424
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2024
- - C:\Users\Admin\AppData\Roaming\windows defender firewall required.exe
    "C:\Users\Admin\AppData\Roaming\windows defender firewall required.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:3488

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

Exfiltration

Impact

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Downloads

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

Filesize
178B

MD5
03ca172766c02e63bcd3173ec6e36d3b

SHA1
42c4cc9627664227ca8ac3cfb8e83197dbdd4e76

SHA256
1cf12145c1220d91d7e8ae2bb146babf0aaea02fe75bc63d3da1cea2d2761ae8

SHA512
12a6407c24facbaee41c7780e2d3da41f719c62c0d784287078aae5ec36419a27b2a4c7d74ba96772d6d71a0d224a9d29de0bb704871a7016ba64d641814a88e

Download Submit
C:\Users\Admin\AppData\Roaming\windows defender firewall required.exe

Filesize
48KB

MD5
3d9e11f133404b0de3f4fd7e375e3fbf

SHA1
1da48c172f95eb337a3b3427f6360d112abf907e

SHA256
929bd74e00c56ec0935d5390a89dd4942abc1f3511a267034739fff0491e350b

SHA512
77aa948b664f957851bb33d2276df7315d5f05abe912bed1214f6e37270a525799fb04cacd0e17a6c07fff55f96a32222ecf71fcf2104e71de153c64de8f147c

Download Submit
memory/3272-0-0x00007FFEAEFA3000-0x00007FFEAEFA5000-memory.dmp

Filesize
8KB

Download
memory/3272-1-0x0000000000620000-0x0000000000632000-memory.dmp

Filesize
72KB

Download
memory/3272-2-0x00007FFEAEFA0000-0x00007FFEAFA61000-memory.dmp

Filesize
10.8MB

Download
memory/3272-7-0x00007FFEAEFA0000-0x00007FFEAFA61000-memory.dmp

Filesize
10.8MB

Download