asyncrat | d81b9779ced62d1f6e6af08d6694dda04aee3e667b8510d19190073af826b684

General

Target
tmps9493ulm.exe
Size 45KB
Sample260602-kwfpasht4w
SHA256 d81b9779ced62d1f6e6af08d6694dda04aee3e667b8510d19190073af826b684
MD5 acf3cdc65a871a7103b099cf124a456e
SHA1 9cf95de8e0bce15b807323560576dcd641caae6d
SHA512 3ad366bec17b7b1f2fa260f757ab29a58ae56ae6f25b659ab51b90ff3bed9393095065e8f49e1b2a4a061412139f43bbaae214b578ac55f0d72a544d75f8fdea
SSDEEP 768:Yu9QdTsw6PpWUBRxTmo2qtbzjHy/aKPIbRjbagX3ilEhxiFWgySD58BDZrx:Yu9QdTs9324nhbBbNXSk0VyG5adrx
TLSH
T107232B003BE8812BF2BE4F789DF26145857AF5633A03D68D1CC4519B5713BC68A52AFA
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

best-comic-books.com:443
best-comic-books.com:80
www.best-comic-books.com:443
www.best-comic-books.com:80
melissa.best-comic-books.com:443
melissa.best-comic-books.com:80
qbot.best-comic-books.com:443
qbot.best-comic-books.com:80

Mutex

lACHW04kzzoh

Attributes

delay
0
install
true
install_file
xj3di28.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
behavioral2/files/0x0008000000024354-8.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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	tmps9493ulm.exe

Executes dropped EXE 2 IoCs

pid	Process
3452	xj3di28.exe
1320	xj3di28.exe

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

System Information Discovery
T1082

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	xj3di28.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	xj3di28.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmps9493ulm.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
760	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
1764	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe
1976	tmps9493ulm.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1976	tmps9493ulm.exe
Token: SeDebugPrivilege	3452	xj3di28.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1976 wrote to memory of 4076	1976	tmps9493ulm.exe	90
PID 1976 wrote to memory of 1828	1976	tmps9493ulm.exe	92
PID 1828 wrote to memory of 760	1828	cmd.exe	94
PID 4076 wrote to memory of 1764	4076	cmd.exe	95
PID 1828 wrote to memory of 1320	1828	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\tmps9493ulm.exe
"C:\Users\Admin\AppData\Local\Temp\tmps9493ulm.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1976
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "xj3di28" /tr '"C:\Users\Admin\AppData\Roaming\xj3di28.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4076
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "xj3di28" /tr '"C:\Users\Admin\AppData\Roaming\xj3di28.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1764
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp640.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1828
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:760
- - C:\Users\Admin\AppData\Roaming\xj3di28.exe
    "C:\Users\Admin\AppData\Roaming\xj3di28.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1320

C:\Users\Admin\AppData\Roaming\xj3di28.exe
"C:\Users\Admin\AppData\Roaming\xj3di28.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3452

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

tmp640.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp640.tmp.bat
Size 150B
SHA256 ed2e5380e1786bccf095bfff7adee235e4a7e90e2f5c90b65aea86b4c96d5cef
MD5 4267d12c3d07860db262ba83d965494a
SHA1 25446de7922bc1d02b7c21f09804f78cec7ecedb
SHA512 175bbcc2a9245915511b00ec2ee0f280ba86255a9d09f7631adf1932717b7ce3fe0fc3f505781984198dc0f93cb8675f6a1f67ba3d584d9bc6c961b4c4b8779e
TLSH
T1C9C02B8361C5FA1E6805146F12FBD6CCA172AC193F40BB00CB04480D1280848F0D9381
MD5 SHA1 SHA512 TLSH

Submit Download

xj3di28.exe

Path C:\Users\Admin\AppData\Roaming\xj3di28.exe
Size 45KB
SHA256 d81b9779ced62d1f6e6af08d6694dda04aee3e667b8510d19190073af826b684
MD5 acf3cdc65a871a7103b099cf124a456e
SHA1 9cf95de8e0bce15b807323560576dcd641caae6d
SHA512 3ad366bec17b7b1f2fa260f757ab29a58ae56ae6f25b659ab51b90ff3bed9393095065e8f49e1b2a4a061412139f43bbaae214b578ac55f0d72a544d75f8fdea
SSDEEP 768:Yu9QdTsw6PpWUBRxTmo2qtbzjHy/aKPIbRjbagX3ilEhxiFWgySD58BDZrx:Yu9QdTs9324nhbBbNXSk0VyG5adrx
TLSH
T107232B003BE8812BF2BE4F789DF26145857AF5633A03D68D1CC4519B5713BC68A52AFA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1976-0-0x00000000003A0000-0x00000000003B2000-memory.dmp

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memory/1976-1-0x0000000004D20000-0x0000000004D30000-memory.dmp

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memory/1976-2-0x0000000004DD0000-0x0000000004E6C000-memory.dmp

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memory/3452-10-0x0000000005360000-0x0000000005370000-memory.dmp

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memory/3452-13-0x0000000005360000-0x0000000005370000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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