asyncrat | 735034c25663f558ff44d90634fd4de59d8787ea0955af4be3cfbbc531f924ad

General

Target
tmpc44pd862.exe
Size 45KB
Sample260522-x84ccaf18x
SHA256 735034c25663f558ff44d90634fd4de59d8787ea0955af4be3cfbbc531f924ad
MD5 d36720ca0d96c7b4d3eccfe26d728dcc
SHA1 abe4441a8b107b522865c8754fe0368bba0968f2
SHA512 5419620dfea3a4c93d9f392a3705ccd11adcfe20d47a527867c4169194cd032ac372eb664c149001ec545e8b07415cf60a06e77e58d21e1005d7143a05633f12
SSDEEP 768:cuRxJTPUYkEWUmjWymo2q1f0eUNEARViZPI6zjbigZ3iGhnuDJQKBDZUx:cuRxJTPjY2mUe+iW63bFZSGhnU/dUx
TLSH
T1F5234C003BE9812BF2BE4F78A9F26145867AF2672603D54A1CC451DB4723FC68A436FD
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

cocodemarsw.com:443
cocodemarsw.com:80
cocodemarsw.com:7797
cocodemarsw.com:8707
cocodemarsw.com:6620
www.cocodemarsw.com:443
www.cocodemarsw.com:80
www.cocodemarsw.com:7797
www.cocodemarsw.com:8707
www.cocodemarsw.com:6620
hack.cocodemarsw.com:443
hack.cocodemarsw.com:80
hack.cocodemarsw.com:7797
hack.cocodemarsw.com:8707
hack.cocodemarsw.com:6620
hermeticwiper.cocodemarsw.com:443
hermeticwiper.cocodemarsw.com:80
hermeticwiper.cocodemarsw.com:7797
hermeticwiper.cocodemarsw.com:8707
hermeticwiper.cocodemarsw.com:6620
ursnif.cocodemarsw.com:443
ursnif.cocodemarsw.com:80
ursnif.cocodemarsw.com:7797
ursnif.cocodemarsw.com:8707
ursnif.cocodemarsw.com:6620
sodinokibi.cocodemarsw.com:443
sodinokibi.cocodemarsw.com:80
sodinokibi.cocodemarsw.com:7797
sodinokibi.cocodemarsw.com:8707
sodinokibi.cocodemarsw.com:6620

Mutex

mZ4evxSpzNA4

Attributes

delay
0
install
true
install_file
m66i.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/0x000800000002453f-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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	tmpc44pd862.exe

Executes dropped EXE 2 IoCs

pid	Process
1160	m66i.exe
2580	m66i.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	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	m66i.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	m66i.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmpc44pd862.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1280	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
4636	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe
5016	tmpc44pd862.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5016	tmpc44pd862.exe
Token: SeDebugPrivilege	1160	m66i.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 5016 wrote to memory of 4964	5016	tmpc44pd862.exe	85
PID 5016 wrote to memory of 512	5016	tmpc44pd862.exe	87
PID 512 wrote to memory of 1280	512	cmd.exe	89
PID 4964 wrote to memory of 4636	4964	cmd.exe	90
PID 512 wrote to memory of 2580	512	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\tmpc44pd862.exe
"C:\Users\Admin\AppData\Local\Temp\tmpc44pd862.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5016
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "m66i" /tr '"C:\Users\Admin\AppData\Roaming\m66i.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4964
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "m66i" /tr '"C:\Users\Admin\AppData\Roaming\m66i.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4636
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9AC4.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:512
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1280
- - C:\Users\Admin\AppData\Roaming\m66i.exe
    "C:\Users\Admin\AppData\Roaming\m66i.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2580

C:\Users\Admin\AppData\Roaming\m66i.exe
"C:\Users\Admin\AppData\Roaming\m66i.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1160

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

tmp9AC4.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp9AC4.tmp.bat
Size 148B
SHA256 fb0596f8385963b0077dba160f2b1763cc756eb31fd0c07b8a14dcacffc2ae51
MD5 a93a0eafe4cf98735f24b5354a3c201d
SHA1 f4805b5377f5669edc4db1d120acc5df83fffdf3
SHA512 f529a22bbc317d8791f44bf8ba5d3bcbc92d241dd6f5274cb6304850dd055b439079792e1c1da81e59729791366093ff5bfb864daffbbf3c5caad1148dd104da
TLSH
T14DC02B8391C5EA9E6C05141312FAD88CE1B27D1D3F81FF40C388405E1280848F0DA345
MD5 SHA1 SHA512 TLSH

Submit Download

m66i.exe

Path C:\Users\Admin\AppData\Roaming\m66i.exe
Size 45KB
SHA256 735034c25663f558ff44d90634fd4de59d8787ea0955af4be3cfbbc531f924ad
MD5 d36720ca0d96c7b4d3eccfe26d728dcc
SHA1 abe4441a8b107b522865c8754fe0368bba0968f2
SHA512 5419620dfea3a4c93d9f392a3705ccd11adcfe20d47a527867c4169194cd032ac372eb664c149001ec545e8b07415cf60a06e77e58d21e1005d7143a05633f12
SSDEEP 768:cuRxJTPUYkEWUmjWymo2q1f0eUNEARViZPI6zjbigZ3iGhnuDJQKBDZUx:cuRxJTPjY2mUe+iW63bFZSGhnU/dUx
TLSH
T1F5234C003BE9812BF2BE4F78A9F26145867AF2672603D54A1CC451DB4723FC68A436FD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1160-10-0x0000000005500000-0x0000000005510000-memory.dmp

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memory/1160-13-0x0000000005500000-0x0000000005510000-memory.dmp

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memory/5016-0-0x0000000000860000-0x0000000000872000-memory.dmp

Download

memory/5016-1-0x0000000002CF0000-0x0000000002D00000-memory.dmp

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memory/5016-2-0x00000000052A0000-0x000000000533C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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