asyncrat | 716b12fa63c467b57e24182ae3af25b738fc589f3f4f0aa5c516190f3eefbf00

General

Target

Client.exe
Size

48KB
MD5

77ca225fb7c84aad1e8ee9ead0110b4c
SHA1

b26e40f8e945f4db6621d7ca5a575a84c0565f91
SHA256

716b12fa63c467b57e24182ae3af25b738fc589f3f4f0aa5c516190f3eefbf00
SHA512

e8f2138cd82714ba58a30d9b48c7e61a6c42b17db297c332e078db544575404382ccf16dbd5bd0aced9342186b05b65a1da0426062b10729a40123a5887e3bbb
SSDEEP

768:ywpRILv+sx+LiEtelDSN+iV08YbygeYslsoo7RSYFr0bvEgK/JfZVc6KN:ywcpEtKDs4zb10rqjF4nkJfZVclN

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

127.0.0.1:8848

127.0.0.1:59953

fojeweb571-59953.portmap.host:8848

fojeweb571-59953.portmap.host:59953

Mutex

DcRatMutex_qwqdanchun

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

rat

resource	yara_rule
behavioral2/files/0x0009000000023cb2-10.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-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
2056	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

evasion

pid	Process
1140	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
452	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe
4264	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4264	Client.exe
Token: SeDebugPrivilege	2056	windows defender firewall required.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4264 wrote to memory of 4724	4264	Client.exe	82
PID 4264 wrote to memory of 4724	4264	Client.exe	82
PID 4264 wrote to memory of 1472	4264	Client.exe	84
PID 4264 wrote to memory of 1472	4264	Client.exe	84
PID 1472 wrote to memory of 1140	1472	cmd.exe	86
PID 1472 wrote to memory of 1140	1472	cmd.exe	86
PID 4724 wrote to memory of 452	4724	cmd.exe	87
PID 4724 wrote to memory of 452	4724	cmd.exe	87
PID 1472 wrote to memory of 2056	1472	cmd.exe	88
PID 1472 wrote to memory of 2056	1472	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\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:4264
- 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:4724
- - 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:452
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA3B2.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1472
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1140
- - 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:2056

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpA3B2.tmp.bat

Filesize
178B

MD5
d9c0c4eb38603d50730f46d78a85d90d

SHA1
6a0c5f88484e41ebe69cdd53df4e3cb1357d7b68

SHA256
276ffd8f5e62e8d7067f2ca35ab72fb8bd6c30652b77cf1d486e697fd875dc20

SHA512
71f28e431a6471855c012a6860c7ddcc032bc85354d6d23be862285fb24bfefecf1a8d0a41efbf0e268f5c73d86bd7135013a95a1a2674849e6a7327c55c6a1a

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

Filesize
48KB

MD5
77ca225fb7c84aad1e8ee9ead0110b4c

SHA1
b26e40f8e945f4db6621d7ca5a575a84c0565f91

SHA256
716b12fa63c467b57e24182ae3af25b738fc589f3f4f0aa5c516190f3eefbf00

SHA512
e8f2138cd82714ba58a30d9b48c7e61a6c42b17db297c332e078db544575404382ccf16dbd5bd0aced9342186b05b65a1da0426062b10729a40123a5887e3bbb

Download Submit
memory/4264-0-0x00007FF857523000-0x00007FF857525000-memory.dmp

Filesize
8KB

Download
memory/4264-1-0x0000000000D10000-0x0000000000D22000-memory.dmp

Filesize
72KB

Download
memory/4264-2-0x00007FF857520000-0x00007FF857FE1000-memory.dmp

Filesize
10.8MB

Download
memory/4264-7-0x00007FF857520000-0x00007FF857FE1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads