asyncrat | 31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2

General

Target
31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
Size 45KB
Sample260804-2lnetshh78
SHA256 31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2
MD5 6051c8133ad56cf7e115b82d3b1ec586
SHA1 bdc5b4a91f7299632dbb26a8f0a18258893f2016
SHA512 56fa97b2cb7e7ff24b02906fba188279cc60b15d80b7a92df26cfaabbb133a7be7ed039e27e158735f192d84699bbf8aef3c3a87e55b3b69af0e8153ffb8464e
SSDEEP 768:cu6RaepTPYzbs8WU+Xaamo2q1HmaPclm3API7zjb5gX3i7rWyIbrlxPsBDZUx:cu6YepTPso2WfcE3l73bWXSTIbr7idUx
TLSH
T184232A003BE9812BF2BE4F7899F26145867AF2636603D64E1CC441DB4723FC69A426FD
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

twosisterstubes.com:80
twosisterstubes.com:22
twosisterstubes.com:8080
twosisterstubes.com:8880
twosisterstubes.com:2052
twosisterstubes.com:2082
twosisterstubes.com:2086
twosisterstubes.com:2095
twosisterstubes.com:443
twosisterstubes.com:2053
twosisterstubes.com:2083
twosisterstubes.com:2087
twosisterstubes.com:2096
twosisterstubes.com:8443
www.twosisterstubes.com:80
www.twosisterstubes.com:22
www.twosisterstubes.com:8080
www.twosisterstubes.com:8880
www.twosisterstubes.com:2052
www.twosisterstubes.com:2082
www.twosisterstubes.com:2086
www.twosisterstubes.com:2095
www.twosisterstubes.com:443
www.twosisterstubes.com:2053
www.twosisterstubes.com:2083
www.twosisterstubes.com:2087
www.twosisterstubes.com:2096
www.twosisterstubes.com:8443
sasser.twosisterstubes.com:80
sasser.twosisterstubes.com:22
sasser.twosisterstubes.com:8080
sasser.twosisterstubes.com:8880
sasser.twosisterstubes.com:2052
sasser.twosisterstubes.com:2082
sasser.twosisterstubes.com:2086
sasser.twosisterstubes.com:2095
sasser.twosisterstubes.com:443
sasser.twosisterstubes.com:2053
sasser.twosisterstubes.com:2083
sasser.twosisterstubes.com:2087
sasser.twosisterstubes.com:2096
sasser.twosisterstubes.com:8443
trickbot.twosisterstubes.com:80
trickbot.twosisterstubes.com:22
trickbot.twosisterstubes.com:8080
trickbot.twosisterstubes.com:8880
trickbot.twosisterstubes.com:2052
trickbot.twosisterstubes.com:2082
trickbot.twosisterstubes.com:2086
trickbot.twosisterstubes.com:2095
trickbot.twosisterstubes.com:443
trickbot.twosisterstubes.com:2053
trickbot.twosisterstubes.com:2083
trickbot.twosisterstubes.com:2087
trickbot.twosisterstubes.com:2096
trickbot.twosisterstubes.com:8443

Mutex

FbO8icw1rApr

Attributes

delay
0
install
true
install_file
w2ehkyjw.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/0x000800000002441b-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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe

Executes dropped EXE 2 IoCs

pid	Process
1564	w2ehkyjw.exe
4432	w2ehkyjw.exe

Outbound SSH connection to public host 2 TTPs 1 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	62	172.67.175.110:22	1564	w2ehkyjw.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
888	cmd.exe
2912	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	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.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	w2ehkyjw.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	w2ehkyjw.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5096	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
1240	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
Token: SeDebugPrivilege	1564	w2ehkyjw.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3036 wrote to memory of 888	3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe	85
PID 3036 wrote to memory of 2912	3036	31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe	87
PID 2912 wrote to memory of 5096	2912	cmd.exe	89
PID 888 wrote to memory of 1240	888	cmd.exe	90
PID 2912 wrote to memory of 4432	2912	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe
"C:\Users\Admin\AppData\Local\Temp\31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3036
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "w2ehkyjw" /tr '"C:\Users\Admin\AppData\Roaming\w2ehkyjw.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:888
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "w2ehkyjw" /tr '"C:\Users\Admin\AppData\Roaming\w2ehkyjw.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1240
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4551.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2912
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5096
- - C:\Users\Admin\AppData\Roaming\w2ehkyjw.exe
    "C:\Users\Admin\AppData\Roaming\w2ehkyjw.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4432

C:\Users\Admin\AppData\Roaming\w2ehkyjw.exe
"C:\Users\Admin\AppData\Roaming\w2ehkyjw.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1564

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

tmp4551.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp4551.tmp.bat
Size 152B
SHA256 6de57a9e2f2c866996e6d19b511ea00d01bddcd8d14b27fb5af5c28a9c4e03f9
MD5 a2c6e670e4409b6207c5a004aab868a8
SHA1 0532c819db4c50ecfe559cae0c25b50ba8d4dd3b
SHA512 6762d6744a87c724a8ca70bb079713a2cc44afb3df93b6e2d3316bdc10ab67537da7bd9636db6c3721d2779a7dd891f1e2a9a5305ce38268c2198511c0c08635
TLSH
T10CC02B4395C6EA4E6806646302FED68CD1B6FC5D3F80BB00C344444D62C0C48F8DD34A
MD5 SHA1 SHA512 TLSH

Submit Download

w2ehkyjw.exe

Path C:\Users\Admin\AppData\Roaming\w2ehkyjw.exe
Size 45KB
SHA256 31739b729bfec813481d8f65af3fa27213adacbb9609d7302e9f63a6020beaf2
MD5 6051c8133ad56cf7e115b82d3b1ec586
SHA1 bdc5b4a91f7299632dbb26a8f0a18258893f2016
SHA512 56fa97b2cb7e7ff24b02906fba188279cc60b15d80b7a92df26cfaabbb133a7be7ed039e27e158735f192d84699bbf8aef3c3a87e55b3b69af0e8153ffb8464e
SSDEEP 768:cu6RaepTPYzbs8WU+Xaamo2q1HmaPclm3API7zjb5gX3i7rWyIbrlxPsBDZUx:cu6YepTPso2WfcE3l73bWXSTIbr7idUx
TLSH
T184232A003BE9812BF2BE4F7899F26145867AF2636603D64E1CC441DB4723FC69A426FD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1564-10-0x00000000055B0000-0x00000000055C0000-memory.dmp

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memory/1564-13-0x00000000055B0000-0x00000000055C0000-memory.dmp

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memory/3036-0-0x0000000000010000-0x0000000000022000-memory.dmp

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memory/3036-1-0x0000000004A60000-0x0000000004A70000-memory.dmp

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memory/3036-2-0x0000000004A70000-0x0000000004B0C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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