asyncrat | d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730

General

Target
d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
Size 45KB
Sample260804-rj2vbssdrf
SHA256 d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730
MD5 7fabfeafd5076e9b7b2cae887335bb5a
SHA1 294a6cbb147427b20d63fc20a9c6daf5a3053201
SHA512 367039c1208a282ce5ec700255c6d881a85c378c82649f51025d39e3820e8f530b3fc116df2a6838fdc8de47d2ba15a74c844fd1898521842b4c58c9fcbaca10
SSDEEP 768:cuR0JTPUYkEWUmjWymo2q1fL5P02FUFdxYkk8PIazjbggX3ineMOTZMp5z4rzBDg:cuR0JTPjY2SLDmWBa3bHXSneXNG5z4J0
TLSH
T1FC231B0037E9C12BF2BE4B78A8F26145867BF6736603D64A1CC451DB5A13BC686436EE
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

xemcliphot.net:80
xemcliphot.net:22
xemcliphot.net:8080
xemcliphot.net:8880
xemcliphot.net:2052
xemcliphot.net:2082
xemcliphot.net:2086
xemcliphot.net:2095
xemcliphot.net:443
xemcliphot.net:2053
xemcliphot.net:2083
xemcliphot.net:2087
xemcliphot.net:2096
xemcliphot.net:8443
www.xemcliphot.net:80
www.xemcliphot.net:22
www.xemcliphot.net:8080
www.xemcliphot.net:8880
www.xemcliphot.net:2052
www.xemcliphot.net:2082
www.xemcliphot.net:2086
www.xemcliphot.net:2095
www.xemcliphot.net:443
www.xemcliphot.net:2053
www.xemcliphot.net:2083
www.xemcliphot.net:2087
www.xemcliphot.net:2096
www.xemcliphot.net:8443
gootloader.xemcliphot.net:80
gootloader.xemcliphot.net:22
gootloader.xemcliphot.net:8080
gootloader.xemcliphot.net:8880
gootloader.xemcliphot.net:2052
gootloader.xemcliphot.net:2082
gootloader.xemcliphot.net:2086
gootloader.xemcliphot.net:2095
gootloader.xemcliphot.net:443
gootloader.xemcliphot.net:2053
gootloader.xemcliphot.net:2083
gootloader.xemcliphot.net:2087
gootloader.xemcliphot.net:2096
gootloader.xemcliphot.net:8443
conficker.xemcliphot.net:80
conficker.xemcliphot.net:22
conficker.xemcliphot.net:8080
conficker.xemcliphot.net:8880
conficker.xemcliphot.net:2052
conficker.xemcliphot.net:2082
conficker.xemcliphot.net:2086
conficker.xemcliphot.net:2095
conficker.xemcliphot.net:443
conficker.xemcliphot.net:2053
conficker.xemcliphot.net:2083
conficker.xemcliphot.net:2087
conficker.xemcliphot.net:2096
conficker.xemcliphot.net:8443

Mutex

D5FSeSEv9uhP

Attributes

delay
0
install
true
install_file
81f3.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
behavioral1/files/0x00080000000245f3-8.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-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe

Executes dropped EXE 2 IoCs

pid	Process
5020	81f3.exe
4888	81f3.exe

Outbound SSH connection to public host 2 TTPs 2 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	33	172.67.154.81:22	5020	81f3.exe
SSH destination	40	104.21.48.157:22	5020	81f3.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
4280	cmd.exe
4116	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	81f3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	81f3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.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	timeout.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3408	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
2200	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
Token: SeDebugPrivilege	5020	81f3.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4820 wrote to memory of 4280	4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe	85
PID 4820 wrote to memory of 4116	4820	d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe	87
PID 4116 wrote to memory of 3408	4116	cmd.exe	89
PID 4280 wrote to memory of 2200	4280	cmd.exe	90
PID 4116 wrote to memory of 4888	4116	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe
"C:\Users\Admin\AppData\Local\Temp\d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4820
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "81f3" /tr '"C:\Users\Admin\AppData\Roaming\81f3.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4280
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "81f3" /tr '"C:\Users\Admin\AppData\Roaming\81f3.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2200
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp2A76.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4116
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3408
- - C:\Users\Admin\AppData\Roaming\81f3.exe
    "C:\Users\Admin\AppData\Roaming\81f3.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4888

C:\Users\Admin\AppData\Roaming\81f3.exe
"C:\Users\Admin\AppData\Roaming\81f3.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:5020

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

tmp2A76.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp2A76.tmp.bat
Size 148B
SHA256 1f8fc4115525842a863b8617148d12abb3b3a9f246895aa0974fb13c906e11d4
MD5 f2dc8b2579d66d28a148060fbdf4a1df
SHA1 ee998fac18ad26d04239134a4ebb0bbe702e32c5
SHA512 48257884148328bad61418e51dfd965fc2283ff7e2cf50b9d3eeeb8a066dcb1568caa2ba27b903f51f34f8c3f855e91251944b2c4f8ecf0d149dcb1616934a6c
TLSH
T141C08C5265C6AA2E2805142302BAA48C91A2682D3E80AB208708400E52C0449E0DA249
MD5 SHA1 SHA512 TLSH

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81f3.exe

Path C:\Users\Admin\AppData\Roaming\81f3.exe
Size 45KB
SHA256 d43b5728594c6ca2631654d1a922ff1b0d4981e2b2d32f9c78677928d5af4730
MD5 7fabfeafd5076e9b7b2cae887335bb5a
SHA1 294a6cbb147427b20d63fc20a9c6daf5a3053201
SHA512 367039c1208a282ce5ec700255c6d881a85c378c82649f51025d39e3820e8f530b3fc116df2a6838fdc8de47d2ba15a74c844fd1898521842b4c58c9fcbaca10
SSDEEP 768:cuR0JTPUYkEWUmjWymo2q1fL5P02FUFdxYkk8PIazjbggX3ineMOTZMp5z4rzBDg:cuR0JTPjY2SLDmWBa3bHXSneXNG5z4J0
TLSH
T1FC231B0037E9C12BF2BE4B78A8F26145867BF6736603D64A1CC451DB5A13BC686436EE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/4820-0-0x0000000000A40000-0x0000000000A52000-memory.dmp

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memory/4820-1-0x0000000005360000-0x0000000005370000-memory.dmp

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memory/4820-2-0x00000000052B0000-0x000000000534C000-memory.dmp

Download

memory/5020-10-0x0000000004C20000-0x0000000004C30000-memory.dmp

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memory/5020-13-0x0000000004C20000-0x0000000004C30000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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