asyncrat | 9081f9cf986ed111d976a07ee26fc2b1b9992301344197d6d3f83fe0d2616023

General

Target

Start.exe
Size

45KB
MD5

b733e729705bf66c1e5c66d97e247701
SHA1

25eec814abdf1fc6afe621e16aa89c4eb42616b9
SHA256

9081f9cf986ed111d976a07ee26fc2b1b9992301344197d6d3f83fe0d2616023
SHA512

09b59b8942c1409a03ca4e7f77c6007160af4d557386b766516dba392750869c017d0fd5d6fbbfcbb3e559a70ad42adcb498595df186be180cfc04e921d74320
SSDEEP

768:Nu2/0TckJ26WUsFvgmo2q7MKjPGaG6PIyzjbFgX3iWlcF4S0ru1pYI0sBDZOx:Nu2/0TceH2ZKTkDy3bCXSWlc6SKuRjdM

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

66.66.146.74:9511

Mutex

nwJFeGdDXcL2

Attributes

delay
3
install
true
install_file
System32.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/0x000a000000023c71-11.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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	Start.exe

Executes dropped EXE 1 IoCs

pid	Process
2412	System32.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	System32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Start.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4156	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
2860	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe
3852	Start.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3852	Start.exe
Token: SeDebugPrivilege	2412	System32.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3852 wrote to memory of 2004	3852	Start.exe	85
PID 3852 wrote to memory of 2004	3852	Start.exe	85
PID 3852 wrote to memory of 2004	3852	Start.exe	85
PID 3852 wrote to memory of 684	3852	Start.exe	87
PID 3852 wrote to memory of 684	3852	Start.exe	87
PID 3852 wrote to memory of 684	3852	Start.exe	87
PID 684 wrote to memory of 4156	684	cmd.exe	90
PID 684 wrote to memory of 4156	684	cmd.exe	90
PID 684 wrote to memory of 4156	684	cmd.exe	90
PID 2004 wrote to memory of 2860	2004	cmd.exe	89
PID 2004 wrote to memory of 2860	2004	cmd.exe	89
PID 2004 wrote to memory of 2860	2004	cmd.exe	89
PID 684 wrote to memory of 2412	684	cmd.exe	95
PID 684 wrote to memory of 2412	684	cmd.exe	95
PID 684 wrote to memory of 2412	684	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\Start.exe
"C:\Users\Admin\AppData\Local\Temp\Start.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3852
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "System32" /tr '"C:\Users\Admin\AppData\Roaming\System32.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2004
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "System32" /tr '"C:\Users\Admin\AppData\Roaming\System32.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2860
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB70B.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:684
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4156
- - C:\Users\Admin\AppData\Roaming\System32.exe
    "C:\Users\Admin\AppData\Roaming\System32.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2412

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

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpB70B.tmp.bat

Filesize
152B

MD5
8176d15855941807d8748f47ef14ea23

SHA1
0552e7879fdb53111ca9f9814859dbabef48103c

SHA256
0eb801faed9b4ce63103513758288a5d11dfe18a87f107ea3c4ba13359229dea

SHA512
7cb9a4f712d49711704df04c588cbf5a4f547d75b01b85ec3107121821b0ef377df3b792d2bfefc3db91d473d0271f5ffaf827da03008b3bf764d15fd459e72f

Download Submit
C:\Users\Admin\AppData\Roaming\System32.exe

Filesize
45KB

MD5
b733e729705bf66c1e5c66d97e247701

SHA1
25eec814abdf1fc6afe621e16aa89c4eb42616b9

SHA256
9081f9cf986ed111d976a07ee26fc2b1b9992301344197d6d3f83fe0d2616023

SHA512
09b59b8942c1409a03ca4e7f77c6007160af4d557386b766516dba392750869c017d0fd5d6fbbfcbb3e559a70ad42adcb498595df186be180cfc04e921d74320

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memory/2412-13-0x0000000074B30000-0x00000000752E0000-memory.dmp

Filesize
7.7MB

Download
memory/2412-16-0x0000000005DC0000-0x0000000006364000-memory.dmp

Filesize
5.6MB

Download
memory/2412-17-0x0000000005310000-0x0000000005376000-memory.dmp

Filesize
408KB

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memory/2412-18-0x0000000074B30000-0x00000000752E0000-memory.dmp

Filesize
7.7MB

Download
memory/3852-0-0x0000000074BDE000-0x0000000074BDF000-memory.dmp

Filesize
4KB

Download
memory/3852-1-0x0000000000550000-0x0000000000562000-memory.dmp

Filesize
72KB

Download
memory/3852-2-0x0000000074BD0000-0x0000000075380000-memory.dmp

Filesize
7.7MB

Download
memory/3852-3-0x0000000004DD0000-0x0000000004E6C000-memory.dmp

Filesize
624KB

Download
memory/3852-8-0x0000000074BD0000-0x0000000075380000-memory.dmp

Filesize
7.7MB

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads