asyncrat | bafa775b4ec9790cf358c28aff8492e67cdec8bdfdc77902a369f0d75c4c3815

General

Target
tmpkyoi_ybt.exe
Size 45KB
Sample260522-yml2lses6n
SHA256 bafa775b4ec9790cf358c28aff8492e67cdec8bdfdc77902a369f0d75c4c3815
MD5 b4c46ae2814fd17e0c04942e04eb47be
SHA1 e1eb828f7dec2153757dda0abecc0740a7890668
SHA512 e5879f4986077fb7d89bbfa894e30fc8ab053207447ae1dd2b2f8a6cdebc61053f8ed9b15b387275c76344f5e2178bb32890ce62a3f708327bf3e0a6a8dd21b9
SSDEEP 768:JuNz1TtADT1WUVoJPmo2q44ZTohEaSPIyzjb9gX3iFQWEy3OfyhqHX3fPBDZbx:JuNz1Tts42i4Ea7y3bqXSF88OK4Xxdbx
TLSH
T1D2232C003BE8812BF2BE4F785CF26145867AF1B77603D54D2CC452D75613BC69A42AFA
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

hermesroadside.com:443
hermesroadside.com:80
hermesroadside.com:7797
hermesroadside.com:8707
hermesroadside.com:6620
www.hermesroadside.com:443
www.hermesroadside.com:80
www.hermesroadside.com:7797
www.hermesroadside.com:8707
www.hermesroadside.com:6620
clop.hermesroadside.com:443
clop.hermesroadside.com:80
clop.hermesroadside.com:7797
clop.hermesroadside.com:8707
clop.hermesroadside.com:6620
zeus.hermesroadside.com:443
zeus.hermesroadside.com:80
zeus.hermesroadside.com:7797
zeus.hermesroadside.com:8707
zeus.hermesroadside.com:6620

Mutex

fgtIAjNT96f6

Attributes

delay
0
install
true
install_file
o84e5.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 2 IoCs

rat

resource	yara_rule
behavioral2/files/0x00080000000243c8-8.dat	family_asyncrat
behavioral2/memory/1304-10-0x0000000004E30000-0x0000000004E40000-memory.dmp	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-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	tmpkyoi_ybt.exe

Executes dropped EXE 2 IoCs

pid	Process
1304	o84e5.exe
2084	o84e5.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	tmpkyoi_ybt.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	o84e5.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	o84e5.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4380	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
1732	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe
5104	tmpkyoi_ybt.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5104	tmpkyoi_ybt.exe
Token: SeDebugPrivilege	1304	o84e5.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 5104 wrote to memory of 3212	5104	tmpkyoi_ybt.exe	89
PID 5104 wrote to memory of 5112	5104	tmpkyoi_ybt.exe	91
PID 3212 wrote to memory of 1732	3212	cmd.exe	93
PID 5112 wrote to memory of 4380	5112	cmd.exe	94
PID 5112 wrote to memory of 2084	5112	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\tmpkyoi_ybt.exe
"C:\Users\Admin\AppData\Local\Temp\tmpkyoi_ybt.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5104
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "o84e5" /tr '"C:\Users\Admin\AppData\Roaming\o84e5.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3212
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "o84e5" /tr '"C:\Users\Admin\AppData\Roaming\o84e5.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1732
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3AC2.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5112
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4380
- - C:\Users\Admin\AppData\Roaming\o84e5.exe
    "C:\Users\Admin\AppData\Roaming\o84e5.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2084

C:\Users\Admin\AppData\Roaming\o84e5.exe
"C:\Users\Admin\AppData\Roaming\o84e5.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1304

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

tmp3AC2.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp3AC2.tmp.bat
Size 149B
SHA256 62abb59f2e02750ff080f165b31daebd5c76eee0d1bc5cdb335406beccbb3a8d
MD5 ee9c7269d5f957b7dddfaca6c63acf60
SHA1 a9b79299960525371dec35290fc919afd356f692
SHA512 374b74461a946f75fa5dc3f2e06c23c9cf940e58cde818770650ae5b3190794c004444dc8a96518292042c3e17de4c25bc4446ac6d44a17c0f82631167a8c92c
TLSH
T14AC02B82D5CAEE6E6C05743306FAE48E91B66C593F40BB00C78C800D3280849F4D9341
MD5 SHA1 SHA512 TLSH

Submit Download

o84e5.exe

Path C:\Users\Admin\AppData\Roaming\o84e5.exe
Size 45KB
SHA256 bafa775b4ec9790cf358c28aff8492e67cdec8bdfdc77902a369f0d75c4c3815
MD5 b4c46ae2814fd17e0c04942e04eb47be
SHA1 e1eb828f7dec2153757dda0abecc0740a7890668
SHA512 e5879f4986077fb7d89bbfa894e30fc8ab053207447ae1dd2b2f8a6cdebc61053f8ed9b15b387275c76344f5e2178bb32890ce62a3f708327bf3e0a6a8dd21b9
SSDEEP 768:JuNz1TtADT1WUVoJPmo2q44ZTohEaSPIyzjb9gX3iFQWEy3OfyhqHX3fPBDZbx:JuNz1Tts42i4Ea7y3bqXSF88OK4Xxdbx
TLSH
T1D2232C003BE8812BF2BE4F785CF26145867AF1B77603D54D2CC452D75613BC69A42AFA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1304-10-0x0000000004E30000-0x0000000004E40000-memory.dmp

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memory/1304-13-0x0000000004E30000-0x0000000004E40000-memory.dmp

Download

memory/5104-0-0x0000000000F20000-0x0000000000F32000-memory.dmp

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memory/5104-1-0x0000000005930000-0x0000000005940000-memory.dmp

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memory/5104-2-0x0000000005940000-0x00000000059DC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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