asyncrat | 4ce4ae76ccf0787e7fdbc7841c1e9e553831533b39e50c45e35c0f243e1409c8

General

Target

Desktop.exe
Size

611KB
MD5

0477439dfc65222b446ca4a31c6a5bcd
SHA1

17e04cdc917891b25f0f585375e142fcc140403f
SHA256

4ce4ae76ccf0787e7fdbc7841c1e9e553831533b39e50c45e35c0f243e1409c8
SHA512

1f584a63ce4f3301325c81a920341de79cf3d5fe8d2f4cfffc8b086a5f1b1e2d6443bcfae9067f1a224d46c55a00be85e5e8957b7658ed965ccd27eae670024f
SSDEEP

6144:Bz1eXfQ+IqV6EL8aVh3ZqK8DN/ya7cLyMO84+c4Edd47BXAFk/yDwZpLptmZMDlp:qngM8K8P4ElXddah8kyDIZDWgfMAJ

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

C2

6.tcp.ngrok.io:17720

Attributes

delay
1
install
true
install_file
idk.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/0x000f000000023b59-4.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-1-5-21-250031470-1197856012-2659781506-1000\Control Panel\International\Geo\Nation	infected.exe
Key value queried	\REGISTRY\USER\S-1-5-21-250031470-1197856012-2659781506-1000\Control Panel\International\Geo\Nation	Desktop.exe

Executes dropped EXE 2 IoCs

pid	Process
1200	infected.exe
460	idk.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs

Web Service

T1102

flow	ioc
28	6.tcp.ngrok.io
74	6.tcp.ngrok.io
89	6.tcp.ngrok.io

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
1368	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
3140	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe
1200	infected.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1200	infected.exe
Token: SeDebugPrivilege	460	idk.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4992 wrote to memory of 1200	4992	Desktop.exe	94
PID 4992 wrote to memory of 1200	4992	Desktop.exe	94
PID 1200 wrote to memory of 3328	1200	infected.exe	96
PID 1200 wrote to memory of 3328	1200	infected.exe	96
PID 1200 wrote to memory of 3568	1200	infected.exe	99
PID 1200 wrote to memory of 3568	1200	infected.exe	99
PID 3328 wrote to memory of 3140	3328	cmd.exe	101
PID 3328 wrote to memory of 3140	3328	cmd.exe	101
PID 3568 wrote to memory of 1368	3568	cmd.exe	102
PID 3568 wrote to memory of 1368	3568	cmd.exe	102
PID 3568 wrote to memory of 460	3568	cmd.exe	103
PID 3568 wrote to memory of 460	3568	cmd.exe	103

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\Desktop.exe
"C:\Users\Admin\AppData\Local\Temp\Desktop.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4992
- C:\Users\Admin\AppData\Local\Temp\RarSFX0\infected.exe
  "C:\Users\Admin\AppData\Local\Temp\RarSFX0\infected.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1200
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "idk" /tr '"C:\Users\Admin\AppData\Roaming\idk.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3328
  - - C:\Windows\system32\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "idk" /tr '"C:\Users\Admin\AppData\Roaming\idk.exe"'
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:3140
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAF1C.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3568
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:1368
  - - C:\Users\Admin\AppData\Roaming\idk.exe
      "C:\Users\Admin\AppData\Roaming\idk.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      PID:460

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\RarSFX0\Infected.exe

Filesize
63KB

MD5
2f78d668a4ca22f400e30dfb8b28f47f

SHA1
98690e10a528b1944633c1dfc7006114020b4d30

SHA256
5a360eff532c0d083e250741c0607a4c7a7dff434c16d7b0512965752f6f8522

SHA512
b6157efc937711732c95719e204fdf50cbafa112fbd8db74280553b12cc91dc32652a5814ab583205df767d7c879a9abafabe68eb1784b8b3b4bfcb0d2fbca36

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpAF1C.tmp.bat

Filesize
147B

MD5
f926cc72bb0329043cd7bdf330076de0

SHA1
71ed2d555e2384e01d53b06cd5ca34fa4690c1a3

SHA256
9979e7677ec0e31fef6ca06d1b8efbe86219babbd1f738b299544c956fdd79cd

SHA512
3ac58b3a2d2210281f1cad498729e0a677fe437bd575214324faa2f6f20395c2780747c2026ca170cd3417aaa163dcd6c58daae7341c86b2600162bd37c0f6e3

Download Submit
memory/1200-12-0x00007FFE77F03000-0x00007FFE77F05000-memory.dmp

Filesize
8KB

Download
memory/1200-13-0x00000000000D0000-0x00000000000E6000-memory.dmp

Filesize
88KB

Download
memory/1200-14-0x00007FFE77F00000-0x00007FFE789C1000-memory.dmp

Filesize
10.8MB

Download
memory/1200-15-0x00007FFE77F00000-0x00007FFE789C1000-memory.dmp

Filesize
10.8MB

Download
memory/1200-20-0x00007FFE77F00000-0x00007FFE789C1000-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