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
behavioral1/files/0x000c00000001202c-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2864	System32.exe

Loads dropped DLL 1 IoCs

pid	Process
2216	cmd.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	Start.exe
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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	System32.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2120	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
2820	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1720	Start.exe
1720	Start.exe
1720	Start.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1720	Start.exe
Token: SeDebugPrivilege	2864	System32.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1720 wrote to memory of 1760	1720	Start.exe	30
PID 1720 wrote to memory of 1760	1720	Start.exe	30
PID 1720 wrote to memory of 1760	1720	Start.exe	30
PID 1720 wrote to memory of 1760	1720	Start.exe	30
PID 1720 wrote to memory of 2216	1720	Start.exe	32
PID 1720 wrote to memory of 2216	1720	Start.exe	32
PID 1720 wrote to memory of 2216	1720	Start.exe	32
PID 1720 wrote to memory of 2216	1720	Start.exe	32
PID 1760 wrote to memory of 2820	1760	cmd.exe	34
PID 1760 wrote to memory of 2820	1760	cmd.exe	34
PID 1760 wrote to memory of 2820	1760	cmd.exe	34
PID 1760 wrote to memory of 2820	1760	cmd.exe	34
PID 2216 wrote to memory of 2120	2216	cmd.exe	35
PID 2216 wrote to memory of 2120	2216	cmd.exe	35
PID 2216 wrote to memory of 2120	2216	cmd.exe	35
PID 2216 wrote to memory of 2120	2216	cmd.exe	35
PID 2216 wrote to memory of 2864	2216	cmd.exe	36
PID 2216 wrote to memory of 2864	2216	cmd.exe	36
PID 2216 wrote to memory of 2864	2216	cmd.exe	36
PID 2216 wrote to memory of 2864	2216	cmd.exe	36

C:\Users\Admin\AppData\Local\Temp\Start.exe
"C:\Users\Admin\AppData\Local\Temp\Start.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1720
- 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:1760
- - 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:2820
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpA737.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2216
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2120
- - 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:2864

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

System Information Discovery

1

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\CabC42B.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpA737.tmp.bat

Filesize
152B

MD5
07f29dfd553e422ad184a2c27970ee24

SHA1
e589193f6eb6741b6fb4e14f4928bf92eabe2343

SHA256
19ca48e050f4b15f293c0cbd2d974a8f1b867af95dde88182a7199f7f1d2221d

SHA512
3f0ecca66ee44e71837ec346ddaab501c1d54f74b64be202b0a03950da92ecc98007b185aa88a35bc9a67400d635022e06f2eb1a049d79ec313a414690f51d73

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

Filesize
45KB

MD5
b733e729705bf66c1e5c66d97e247701

SHA1
25eec814abdf1fc6afe621e16aa89c4eb42616b9

SHA256
9081f9cf986ed111d976a07ee26fc2b1b9992301344197d6d3f83fe0d2616023

SHA512
09b59b8942c1409a03ca4e7f77c6007160af4d557386b766516dba392750869c017d0fd5d6fbbfcbb3e559a70ad42adcb498595df186be180cfc04e921d74320

Download Submit
memory/1720-0-0x000000007499E000-0x000000007499F000-memory.dmp

Filesize
4KB

Download
memory/1720-1-0x0000000000E30000-0x0000000000E42000-memory.dmp

Filesize
72KB

Download
memory/1720-2-0x0000000074990000-0x000000007507E000-memory.dmp

Filesize
6.9MB

Download
memory/1720-11-0x0000000074990000-0x000000007507E000-memory.dmp

Filesize
6.9MB

Download
memory/2864-16-0x0000000001380000-0x0000000001392000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads