asyncrat | f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7

General

Target
f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
Size 45KB
Sample260804-pwv67seq7s
SHA256 f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7
MD5 42154ebe47ce7c9acf856bed84641acb
SHA1 052c60e40ee881d8719227f8ca0b127e5f751a48
SHA512 16d9f9bcdc214b8cacdf9907b48d61468431a8a02550c7ba6b7ae993447a9fbd2848615db619af6656b801768e231db5a30f4d093468252ba535db06f23262ed
SSDEEP 768:ku40ZTX3uXTaWUgzW0mo2qwP3Fo9EaOPIFzjbYgX3i3/BIQMcWLFwsB7eKBDZMx:ku40ZTXEb258Ea3F3bPXSPB3McWL6w72
TLSH
T189232A003BE8816BF2BE4F7899F26145867EF5A32603D68D1CC441DB5713FC69A426FA
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default command_and_control defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

fimsexvietnam.com:80
fimsexvietnam.com:22
fimsexvietnam.com:8080
fimsexvietnam.com:8880
fimsexvietnam.com:2052
fimsexvietnam.com:2082
fimsexvietnam.com:2086
fimsexvietnam.com:2095
fimsexvietnam.com:443
fimsexvietnam.com:2053
fimsexvietnam.com:2083
fimsexvietnam.com:2087
fimsexvietnam.com:2096
fimsexvietnam.com:8443
www.fimsexvietnam.com:80
www.fimsexvietnam.com:22
www.fimsexvietnam.com:8080
www.fimsexvietnam.com:8880
www.fimsexvietnam.com:2052
www.fimsexvietnam.com:2082
www.fimsexvietnam.com:2086
www.fimsexvietnam.com:2095
www.fimsexvietnam.com:443
www.fimsexvietnam.com:2053
www.fimsexvietnam.com:2083
www.fimsexvietnam.com:2087
www.fimsexvietnam.com:2096
www.fimsexvietnam.com:8443
invasive.fimsexvietnam.com:80
invasive.fimsexvietnam.com:22
invasive.fimsexvietnam.com:8080
invasive.fimsexvietnam.com:8880
invasive.fimsexvietnam.com:2052
invasive.fimsexvietnam.com:2082
invasive.fimsexvietnam.com:2086
invasive.fimsexvietnam.com:2095
invasive.fimsexvietnam.com:443
invasive.fimsexvietnam.com:2053
invasive.fimsexvietnam.com:2083
invasive.fimsexvietnam.com:2087
invasive.fimsexvietnam.com:2096
invasive.fimsexvietnam.com:8443
locky.fimsexvietnam.com:80
locky.fimsexvietnam.com:22
locky.fimsexvietnam.com:8080
locky.fimsexvietnam.com:8880
locky.fimsexvietnam.com:2052
locky.fimsexvietnam.com:2082
locky.fimsexvietnam.com:2086
locky.fimsexvietnam.com:2095
locky.fimsexvietnam.com:443
locky.fimsexvietnam.com:2053
locky.fimsexvietnam.com:2083
locky.fimsexvietnam.com:2087
locky.fimsexvietnam.com:2096
locky.fimsexvietnam.com:8443
malware.fimsexvietnam.com:80
malware.fimsexvietnam.com:22
malware.fimsexvietnam.com:8080
malware.fimsexvietnam.com:8880
malware.fimsexvietnam.com:2052
malware.fimsexvietnam.com:2082
malware.fimsexvietnam.com:2086
malware.fimsexvietnam.com:2095
malware.fimsexvietnam.com:443
malware.fimsexvietnam.com:2053
malware.fimsexvietnam.com:2083
malware.fimsexvietnam.com:2087
malware.fimsexvietnam.com:2096
malware.fimsexvietnam.com:8443

Mutex

55TsADaQ9SP8

Attributes

delay
0
install
true
install_file
4zo63.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 2 IoCs

rat

resource	yara_rule
behavioral1/files/0x0008000000024530-8.dat	family_asyncrat
behavioral1/memory/4040-10-0x0000000004FA0000-0x0000000004FB0000-memory.dmp	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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe

Executes dropped EXE 2 IoCs

pid	Process
4040	4zo63.exe
1056	4zo63.exe

Outbound SSH connection to public host 2 TTPs 5 IoCs

SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.

command_and_control

Protocol Tunneling

T1572

Network Service Discovery

T1046

description	flow	ioc	pid	Process
SSH destination	73	104.21.36.7:22	4040	4zo63.exe
SSH destination	91	172.67.182.173:22	4040	4zo63.exe
SSH destination	8	172.67.182.173:22	4040	4zo63.exe
SSH destination	32	104.21.36.7:22	4040	4zo63.exe
SSH destination	67	172.67.182.173:22	4040	4zo63.exe

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
1660	cmd.exe
4448	cmd.exe

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	4zo63.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4zo63.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
540	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
2024	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
Token: SeDebugPrivilege	4040	4zo63.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4544 wrote to memory of 1660	4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe	85
PID 4544 wrote to memory of 4448	4544	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe	87
PID 4448 wrote to memory of 540	4448	cmd.exe	89
PID 1660 wrote to memory of 2024	1660	cmd.exe	90
PID 4448 wrote to memory of 1056	4448	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
"C:\Users\Admin\AppData\Local\Temp\f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4544
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "4zo63" /tr '"C:\Users\Admin\AppData\Roaming\4zo63.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1660
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "4zo63" /tr '"C:\Users\Admin\AppData\Roaming\4zo63.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2024
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4EB7.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4448
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:540
- - C:\Users\Admin\AppData\Roaming\4zo63.exe
    "C:\Users\Admin\AppData\Roaming\4zo63.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1056

C:\Users\Admin\AppData\Roaming\4zo63.exe
"C:\Users\Admin\AppData\Roaming\4zo63.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4040

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

Network Service Discovery

Query Registry

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Protocol Tunneling

1

T1572

Exfiltration

Impact

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Downloads

tmp4EB7.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp4EB7.tmp.bat
Size 149B
SHA256 2cae6c8caf3aee47b9f893c789176e029154ffa44c22e9a3d6512556323e9c45
MD5 374e67e21a8325700a430c484b8ab7a6
SHA1 8e6993b44d43ebeb3d34466b914720482628d821
SHA512 184a6ecf045e3d608c98160be7c50dda5d2e42e1d35d23bcdcf24d23bb85a7f44e038c368bca5d8729c562d1830249d22cfe22ff5e7f2335b93ad2a1b5db961a
TLSH
T1A5C02B4395C6EA0F2805645312FAD48C91776C1D3F80BB00C344408D12C0C48F1FA345
MD5 SHA1 SHA512 TLSH

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4zo63.exe

Path C:\Users\Admin\AppData\Roaming\4zo63.exe
Size 45KB
SHA256 f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7
MD5 42154ebe47ce7c9acf856bed84641acb
SHA1 052c60e40ee881d8719227f8ca0b127e5f751a48
SHA512 16d9f9bcdc214b8cacdf9907b48d61468431a8a02550c7ba6b7ae993447a9fbd2848615db619af6656b801768e231db5a30f4d093468252ba535db06f23262ed
SSDEEP 768:ku40ZTX3uXTaWUgzW0mo2qwP3Fo9EaOPIFzjbYgX3i3/BIQMcWLFwsB7eKBDZMx:ku40ZTXEb258Ea3F3bPXSPB3McWL6w72
TLSH
T189232A003BE8816BF2BE4F7899F26145867EF5A32603D68D1CC441DB5713FC69A426FA
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/4040-10-0x0000000004FA0000-0x0000000004FB0000-memory.dmp

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memory/4040-13-0x0000000004FA0000-0x0000000004FB0000-memory.dmp

Download

memory/4544-0-0x0000000000AB0000-0x0000000000AC2000-memory.dmp

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memory/4544-1-0x00000000054D0000-0x00000000054E0000-memory.dmp

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memory/4544-2-0x00000000054E0000-0x000000000557C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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