asyncrat | 26eaa5bce06cadc54cb4990fabb1b9150966ef720b07a836ef2bd456360246b2

General

Target

0x000c0000000193df-60.exe
Size

45KB
MD5

a44a767dba207c04c74afae17144f787
SHA1

fa14f38216e259be5b181c825719f1c864691a5f
SHA256

26eaa5bce06cadc54cb4990fabb1b9150966ef720b07a836ef2bd456360246b2
SHA512

7dfd6e182ac9f16b29843cb0eabaa7db02fa3ee59c65c7822d9213859c4a7185d0fdcd1d51747a11b4fdd3a7947ea14fdc7fa583c13b4d3edf50b8d6d3178619
SSDEEP

768:Pu201T1tMfdWUdLO3mo2qz5qKjPGaG6PIyzjbFgX3i9B0OoEmRtBDZWy:Pu201T1y22sqKTkDy3bCXS9B0OoEmRjV

Score

10^/10

asyncrat discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

C2

blue.o7lab.me:7777

server.underground-cheat.xyz:7777

Mutex

RPYntXGt1eJi

Attributes

delay
3
install
true
install_file
WinUpdate.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x000b00000002339c-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-1-5-21-4182098368-2521458979-3782681353-1000\Control Panel\International\Geo\Nation	0x000c0000000193df-60.exe

Executes dropped EXE 1 IoCs

pid	Process
3900	WinUpdate.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WinUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	0x000c0000000193df-60.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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1916	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
212	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe
1456	0x000c0000000193df-60.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1456	0x000c0000000193df-60.exe
Token: SeDebugPrivilege	3900	WinUpdate.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1456 wrote to memory of 2384	1456	0x000c0000000193df-60.exe	86
PID 1456 wrote to memory of 2384	1456	0x000c0000000193df-60.exe	86
PID 1456 wrote to memory of 2384	1456	0x000c0000000193df-60.exe	86
PID 1456 wrote to memory of 5108	1456	0x000c0000000193df-60.exe	88
PID 1456 wrote to memory of 5108	1456	0x000c0000000193df-60.exe	88
PID 1456 wrote to memory of 5108	1456	0x000c0000000193df-60.exe	88
PID 2384 wrote to memory of 212	2384	cmd.exe	90
PID 2384 wrote to memory of 212	2384	cmd.exe	90
PID 2384 wrote to memory of 212	2384	cmd.exe	90
PID 5108 wrote to memory of 1916	5108	cmd.exe	91
PID 5108 wrote to memory of 1916	5108	cmd.exe	91
PID 5108 wrote to memory of 1916	5108	cmd.exe	91
PID 5108 wrote to memory of 3900	5108	cmd.exe	92
PID 5108 wrote to memory of 3900	5108	cmd.exe	92
PID 5108 wrote to memory of 3900	5108	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\0x000c0000000193df-60.exe
"C:\Users\Admin\AppData\Local\Temp\0x000c0000000193df-60.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1456
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "WinUpdate" /tr '"C:\Users\Admin\AppData\Roaming\WinUpdate.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2384
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "WinUpdate" /tr '"C:\Users\Admin\AppData\Roaming\WinUpdate.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:212
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA856.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5108
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1916
- - C:\Users\Admin\AppData\Roaming\WinUpdate.exe
    "C:\Users\Admin\AppData\Roaming\WinUpdate.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:3900

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmpA856.tmp.bat

Filesize
153B

MD5
ccf1aadb6fbe49034d6e0a3b03c4eecf

SHA1
54174590fcc3a498d054dd0b45aa1acf4e5b12ff

SHA256
101b01d824bc02043613a35effceded77ee982a8ca207a6df75884db0beb8111

SHA512
8c6d3c49dc036f2bff2e318596929e29a951d15c111b9bc44e9bb999ae2490b22830c3a2b14f148dd093da3a0344f53fd27a0f1c9175592b7e931e3b0e0b4f0e

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

Filesize
45KB

MD5
a44a767dba207c04c74afae17144f787

SHA1
fa14f38216e259be5b181c825719f1c864691a5f

SHA256
26eaa5bce06cadc54cb4990fabb1b9150966ef720b07a836ef2bd456360246b2

SHA512
7dfd6e182ac9f16b29843cb0eabaa7db02fa3ee59c65c7822d9213859c4a7185d0fdcd1d51747a11b4fdd3a7947ea14fdc7fa583c13b4d3edf50b8d6d3178619

Download Submit
memory/1456-0-0x000000007520E000-0x000000007520F000-memory.dmp

Filesize
4KB

Download
memory/1456-1-0x0000000000F40000-0x0000000000F52000-memory.dmp

Filesize
72KB

Download
memory/1456-2-0x0000000075200000-0x00000000759B0000-memory.dmp

Filesize
7.7MB

Download
memory/1456-3-0x00000000058D0000-0x000000000596C000-memory.dmp

Filesize
624KB

Download
memory/1456-8-0x0000000075200000-0x00000000759B0000-memory.dmp

Filesize
7.7MB

Download
memory/3900-13-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download
memory/3900-14-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads