asyncrat | f0e48fa47b40b0ffbdd1834f2dfa22007d3e935fdc78c3edf3434ac4f601c64a

General

Target
tmpufyzyy07.exe
Size 45KB
Sample260522-ymazcaes6m
SHA256 f0e48fa47b40b0ffbdd1834f2dfa22007d3e935fdc78c3edf3434ac4f601c64a
MD5 4b064d4ce95d97ba49bca1e29ad90ec7
SHA1 418d7e62f51fbe2f9b31a5b9de801c378f983e20
SHA512 6b681ea48d3827c392d8244b3c4426ed9cd64eed6f28283f5c2e5863013f677d2c72ad720dac4830cdf61d1b7729c87331243d95b9e35efbed952736a780a114
SSDEEP 768:Iu5xkpTsU6Q8WU+xjamo2q1RxJaxMwHuPIvzjbWg/3ip4z6kVqa2So3zDxBDZLx:Iu5xkpTsx/24eN3v3bJ/S7la2SuPdLx
TLSH
T11D232A103BD9822AF2BE4F7899F26145467AF2633603D64D2CC442DB5723FC69A426FD
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

sextop.xxx:443
sextop.xxx:80
sextop.xxx:7797
sextop.xxx:8707
sextop.xxx:6620
www.sextop.xxx:443
www.sextop.xxx:80
www.sextop.xxx:7797
www.sextop.xxx:8707
www.sextop.xxx:6620
conficker.sextop.xxx:443
conficker.sextop.xxx:80
conficker.sextop.xxx:7797
conficker.sextop.xxx:8707
conficker.sextop.xxx:6620
emotet.sextop.xxx:443
emotet.sextop.xxx:80
emotet.sextop.xxx:7797
emotet.sextop.xxx:8707
emotet.sextop.xxx:6620
nimda.sextop.xxx:443
nimda.sextop.xxx:80
nimda.sextop.xxx:7797
nimda.sextop.xxx:8707
nimda.sextop.xxx:6620
codered.sextop.xxx:443
codered.sextop.xxx:80
codered.sextop.xxx:7797
codered.sextop.xxx:8707
codered.sextop.xxx:6620

Mutex

hhbD23tXslFF

Attributes

delay
0
install
true
install_file
d7np0lkj.exe
install_folder
%AppData%

aes.plain

Signatures

Family: 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
behavioral3/files/0x001b00000002b389-8.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
4072	d7np0lkj.exe
4276	d7np0lkj.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 7 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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	d7np0lkj.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	d7np0lkj.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmpufyzyy07.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3124	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
3624	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe
3964	tmpufyzyy07.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3964	tmpufyzyy07.exe
Token: SeDebugPrivilege	4072	d7np0lkj.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3964 wrote to memory of 960	3964	tmpufyzyy07.exe	80
PID 3964 wrote to memory of 4152	3964	tmpufyzyy07.exe	82
PID 960 wrote to memory of 3624	960	cmd.exe	84
PID 4152 wrote to memory of 3124	4152	cmd.exe	85
PID 4152 wrote to memory of 4276	4152	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\tmpufyzyy07.exe
"C:\Users\Admin\AppData\Local\Temp\tmpufyzyy07.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3964
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "d7np0lkj" /tr '"C:\Users\Admin\AppData\Roaming\d7np0lkj.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:960
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "d7np0lkj" /tr '"C:\Users\Admin\AppData\Roaming\d7np0lkj.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3624
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp467A.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4152
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3124
- - C:\Users\Admin\AppData\Roaming\d7np0lkj.exe
    "C:\Users\Admin\AppData\Roaming\d7np0lkj.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4276

C:\Users\Admin\AppData\Roaming\d7np0lkj.exe
"C:\Users\Admin\AppData\Roaming\d7np0lkj.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4072

Network

MITRE ATT&CK Enterprise v16

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

tmp467A.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp467A.tmp.bat
Size 152B
SHA256 c9e5774c0a997f7249cc13eb90804ad40d5ac7f840cce2c5baa4a2b986cf9d73
MD5 3b3a99683185a76ad64973f73d5e7a11
SHA1 d5fa45466b2d9054a74e3d49a29c05a88aa1b192
SHA512 35faea6bee04f58dbb4894b5664fd2b917bfa4b3524b93d7b89807f3428633e5e55d7132bf69c8ca3054d04bf31498a28df74500b6af47e81e5076e42b0f41a4
TLSH
T19CC02B5251C5FA1F2809281303FAD48D92B26C393F80FB40CB04D08DA280848F0DB3D5
MD5 SHA1 SHA512 TLSH

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d7np0lkj.exe

Path C:\Users\Admin\AppData\Roaming\d7np0lkj.exe
Size 45KB
SHA256 f0e48fa47b40b0ffbdd1834f2dfa22007d3e935fdc78c3edf3434ac4f601c64a
MD5 4b064d4ce95d97ba49bca1e29ad90ec7
SHA1 418d7e62f51fbe2f9b31a5b9de801c378f983e20
SHA512 6b681ea48d3827c392d8244b3c4426ed9cd64eed6f28283f5c2e5863013f677d2c72ad720dac4830cdf61d1b7729c87331243d95b9e35efbed952736a780a114
SSDEEP 768:Iu5xkpTsU6Q8WU+xjamo2q1RxJaxMwHuPIvzjbWg/3ip4z6kVqa2So3zDxBDZLx:Iu5xkpTsx/24eN3v3bJ/S7la2SuPdLx
TLSH
T11D232A103BD9822AF2BE4F7899F26145467AF2633603D64D2CC442DB5723FC69A426FD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3964-0-0x0000000000280000-0x0000000000292000-memory.dmp

Download

memory/3964-1-0x0000000004E50000-0x0000000004E60000-memory.dmp

Download

memory/3964-2-0x0000000004D20000-0x0000000004DBC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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