asyncrat | 69994596d9af01637e0e152de55cc790486ca0ca309ae901604804e676b15208

General

Target
ck444app.exe
Size 72KB
Sample260923-21415aff39
SHA256 69994596d9af01637e0e152de55cc790486ca0ca309ae901604804e676b15208
MD5 43eceed30004a39aa499a621aa35283d
SHA1 1c0ebc17777c02fc6e0ad13302b1d98504bc3ede
SHA512 056dcb0ef35f0f4f2070aa9f315e1acafab4d513055971c8eabc3a77abb819235aef6021f8e367ea3ddaa11d9d2effe815f15dd723410834edfe1cbf22216fdf
SSDEEP 1536:cu+Q1TQfb2RXTGY3V3bBZ9LtZGKs8+dueZ5/EAH5hJ:cu+8TQfb25T33V3bBrsFMoltHjJ
TLSH
T1257309302FE486AEF179CE7474A13171CE7AAD772D0EFD49DC8034871A32A859642DE9
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

ck444app.com:6606
ck444app.com:7707
ck444app.com:8808
ck444app.com:80
ck444app.com:443

Mutex

gbVKg37Ceml8

Attributes

delay
10
install
true
install_file
ck444app.com.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/0x0003000000022aee-9.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-1-5-21-939655444-3071939294-1401108526-1000\Control Panel\International\Geo\Nation	ck444app.exe

Executes dropped EXE 2 IoCs

pid	Process
3512	ck444app.com.exe
3368	ck444app.com.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
4976	cmd.exe
968	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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ck444app.com.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ck444app.com.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ck444app.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3080	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
4292	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe
4340	ck444app.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4340	ck444app.exe
Token: SeDebugPrivilege	3512	ck444app.com.exe
Token: SeDebugPrivilege	3512	ck444app.com.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4340 wrote to memory of 4976	4340	ck444app.exe	93
PID 4340 wrote to memory of 968	4340	ck444app.exe	95
PID 968 wrote to memory of 3080	968	cmd.exe	97
PID 4976 wrote to memory of 4292	4976	cmd.exe	98
PID 968 wrote to memory of 3368	968	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\ck444app.exe
"C:\Users\Admin\AppData\Local\Temp\ck444app.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4340
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "ck444app.com" /tr '"C:\Users\Admin\AppData\Roaming\ck444app.com.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4976
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "ck444app.com" /tr '"C:\Users\Admin\AppData\Roaming\ck444app.com.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4292
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp2968.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:968
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3080
- - C:\Users\Admin\AppData\Roaming\ck444app.com.exe
    "C:\Users\Admin\AppData\Roaming\ck444app.com.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3368

C:\Users\Admin\AppData\Roaming\ck444app.com.exe
"C:\Users\Admin\AppData\Roaming\ck444app.com.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3512

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

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

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Downloads

tmp2968.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp2968.tmp.bat
Size 156B
SHA256 67e770c2dfc2cacd0328fa7c53e81ba74c4f2ca7eec320f01a7413e617126478
MD5 9b8d3f53cf750d7cb6f5e0e4dfa8dccc
SHA1 fcc3ef54a3870d23b083251a30e58ef63028c86a
SHA512 33f8d1f2edfadf1517ebfa47b23bce5d417abd09bd030a963e9ab6bcc553e74ef0272870ba1ac78a5d42b5e3e46a05b34352e72c751ed978c7e00c71ea9baac6
TLSH
T1D9C02B6361C6EA1E3C05581B06FFD88DA1736C5A3F84FB50C704801D1B8088DF0E9385
MD5 SHA1 SHA512 TLSH

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ck444app.com.exe

Path C:\Users\Admin\AppData\Roaming\ck444app.com.exe
Size 72KB
SHA256 69994596d9af01637e0e152de55cc790486ca0ca309ae901604804e676b15208
MD5 43eceed30004a39aa499a621aa35283d
SHA1 1c0ebc17777c02fc6e0ad13302b1d98504bc3ede
SHA512 056dcb0ef35f0f4f2070aa9f315e1acafab4d513055971c8eabc3a77abb819235aef6021f8e367ea3ddaa11d9d2effe815f15dd723410834edfe1cbf22216fdf
SSDEEP 1536:cu+Q1TQfb2RXTGY3V3bBZ9LtZGKs8+dueZ5/EAH5hJ:cu+8TQfb25T33V3bBrsFMoltHjJ
TLSH
T1257309302FE486AEF179CE7474A13171CE7AAD772D0EFD49DC8034871A32A859642DE9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4340-0-0x0000000000350000-0x0000000000368000-memory.dmp

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memory/4340-1-0x0000000004D60000-0x0000000004D70000-memory.dmp

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memory/4340-2-0x0000000004CD0000-0x0000000004D36000-memory.dmp

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memory/4340-3-0x0000000005190000-0x000000000522C000-memory.dmp

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Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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