asyncrat | 0c6d6b9dd41b372b509a4a7f11dec5638aeb8f780776c6fe26463ce1c60bd05f

General

Target
R2.exe
Size 49KB
Sample260924-e42nvaea64
SHA256 0c6d6b9dd41b372b509a4a7f11dec5638aeb8f780776c6fe26463ce1c60bd05f
MD5 da0729ab68736a23cb314343a8ff5bbc
SHA1 871fd801a689a53d961037696aa97ef3864a8f21
SHA512 23f06fadd82eaabd7176cab246d29ab22be47b3e1504ca7b621014edba28977274ccc932b2b16fc09301324949af545c655a4c8799f324a0c78327f7bb5c7cf4
SSDEEP 1536:zunlVTR6025EwGKVm33bnXSpQf6zdaJH:zunrTR602mwG0s3bnk9cH
TLSH
T13B3319007BDD812AF6BF4F7859F23101C67AE26B6502DD4A1CE4619E1613BC2C6D27FA
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

s8 defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

S8

C2

xoso6684.com:80
xoso6684.com:443
xoso6684.com:8080
www.xoso6684.com:80
www.xoso6684.com:443
www.xoso6684.com:8080
c2.xoso6684.com:80
c2.xoso6684.com:443
c2.xoso6684.com:8080
malware.xoso6684.com:80
malware.xoso6684.com:443
malware.xoso6684.com:8080
backdoor.xoso6684.com:80
backdoor.xoso6684.com:443
backdoor.xoso6684.com:8080
api.xoso6684.com:80
api.xoso6684.com:443
api.xoso6684.com:8080

Mutex

NyFzKCVMceTw

Attributes

delay
3
install
true
install_file
S8.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/0x000a0000000241ec-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-1-5-21-2101206053-1414382737-268919432-1000\Control Panel\International\Geo\Nation	R2.exe

Executes dropped EXE 2 IoCs

pid	Process
3252	S8.exe
1116	S8.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
4256	cmd.exe
1040	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	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	S8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	S8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	R2.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2340	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
5020	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe
684	R2.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	684	R2.exe
Token: SeDebugPrivilege	3252	S8.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 684 wrote to memory of 4256	684	R2.exe	93
PID 684 wrote to memory of 1040	684	R2.exe	95
PID 4256 wrote to memory of 5020	4256	cmd.exe	97
PID 1040 wrote to memory of 2340	1040	cmd.exe	98
PID 1040 wrote to memory of 1116	1040	cmd.exe	102

C:\Users\Admin\AppData\Local\Temp\R2.exe
"C:\Users\Admin\AppData\Local\Temp\R2.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:684
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "S8" /tr '"C:\Users\Admin\AppData\Roaming\S8.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4256
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "S8" /tr '"C:\Users\Admin\AppData\Roaming\S8.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:5020
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCCD1.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1040
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2340
- - C:\Users\Admin\AppData\Roaming\S8.exe
    "C:\Users\Admin\AppData\Roaming\S8.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1116

C:\Users\Admin\AppData\Roaming\S8.exe
"C:\Users\Admin\AppData\Roaming\S8.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3252

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

tmpCCD1.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpCCD1.tmp.bat
Size 146B
SHA256 94072c40890557553825c38eda126f385de736f8a26454535e3cd8eef78dd0e8
MD5 cc5ca3d17fe6dcd01d16bb1bab7bb7f4
SHA1 ef83aa84c24f7a24814a0b6bcbd7d1b5802cda84
SHA512 381669affe1a4639d7f24c3923dd035f09ba38f25da50ab3d03dafcd42a21d9ea5c642bf629c9a897f3335c183ec4fc93ec07d06757cd16eb1e498a927402307
TLSH
T1F8C02B4261C6EA4E390654530FFED88C9173AC193F44BB10C704480E1680848F4E9342
MD5 SHA1 SHA512 TLSH

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S8.exe

Path C:\Users\Admin\AppData\Roaming\S8.exe
Size 49KB
SHA256 0c6d6b9dd41b372b509a4a7f11dec5638aeb8f780776c6fe26463ce1c60bd05f
MD5 da0729ab68736a23cb314343a8ff5bbc
SHA1 871fd801a689a53d961037696aa97ef3864a8f21
SHA512 23f06fadd82eaabd7176cab246d29ab22be47b3e1504ca7b621014edba28977274ccc932b2b16fc09301324949af545c655a4c8799f324a0c78327f7bb5c7cf4
SSDEEP 1536:zunlVTR6025EwGKVm33bnXSpQf6zdaJH:zunrTR602mwG0s3bnk9cH
TLSH
T13B3319007BDD812AF6BF4F7859F23101C67AE26B6502DD4A1CE4619E1613BC2C6D27FA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/684-0-0x0000000000DE0000-0x0000000000DF2000-memory.dmp

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memory/684-1-0x00000000058C0000-0x00000000058D0000-memory.dmp

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memory/684-2-0x00000000058D0000-0x000000000596C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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