asyncrat | 52fe41a6d25b4da5a29b79b337479f0a11ec12b7b8ce7b6441c91f52f2498e3b

General

Target
tmpig727jvb.exe
Size 45KB
Sample260522-yerbcsgs8v
SHA256 52fe41a6d25b4da5a29b79b337479f0a11ec12b7b8ce7b6441c91f52f2498e3b
MD5 7a00991d2f92c7c437ad9b62ae342f44
SHA1 d403adab41189d005a5365fec186f14b3b493e1d
SHA512 0c977bbf281b368966817e6010911fd1c99565196569172cb9d01b8a3adef4a6b9968ac46c47f7555fa5264e623badea617e5f61de829437d05c29dcb95e793a
SSDEEP 768:RuxBJTVmU5EkWUGMKSmo2q1BuwZQaKkPIQzjbugX3iS8bMWMEBMacZRBDZcx:RuxBJTgip2IIQ3bRXS2WM4MaMdcx
TLSH
T1B123FA003BE9823BF2BE4FB868F26145857AF6636603D5492CC451DB1623FC69A426FD
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

gaisexmup.net:443
gaisexmup.net:80
gaisexmup.net:7797
gaisexmup.net:8707
gaisexmup.net:6620
www.gaisexmup.net:443
www.gaisexmup.net:80
www.gaisexmup.net:7797
www.gaisexmup.net:8707
www.gaisexmup.net:6620
hacker.gaisexmup.net:443
hacker.gaisexmup.net:80
hacker.gaisexmup.net:7797
hacker.gaisexmup.net:8707
hacker.gaisexmup.net:6620
lokibot.gaisexmup.net:443
lokibot.gaisexmup.net:80
lokibot.gaisexmup.net:7797
lokibot.gaisexmup.net:8707
lokibot.gaisexmup.net:6620
gozi.gaisexmup.net:443
gozi.gaisexmup.net:80
gozi.gaisexmup.net:7797
gozi.gaisexmup.net:8707
gozi.gaisexmup.net:6620
ryuk.gaisexmup.net:443
ryuk.gaisexmup.net:80
ryuk.gaisexmup.net:7797
ryuk.gaisexmup.net:8707
ryuk.gaisexmup.net:6620

Mutex

9n81bLvOJVD6

Attributes

delay
0
install
true
install_file
vtexgs41.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/0x00080000000242b4-8.dat	family_asyncrat
behavioral2/memory/5088-13-0x0000000005250000-0x0000000005260000-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-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	tmpig727jvb.exe

Executes dropped EXE 2 IoCs

pid	Process
5088	vtexgs41.exe
3884	vtexgs41.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	tmpig727jvb.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vtexgs41.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vtexgs41.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4820	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
4508	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe
3824	tmpig727jvb.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3824	tmpig727jvb.exe
Token: SeDebugPrivilege	5088	vtexgs41.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3824 wrote to memory of 3020	3824	tmpig727jvb.exe	89
PID 3824 wrote to memory of 4308	3824	tmpig727jvb.exe	91
PID 4308 wrote to memory of 4820	4308	cmd.exe	93
PID 3020 wrote to memory of 4508	3020	cmd.exe	94
PID 4308 wrote to memory of 3884	4308	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\tmpig727jvb.exe
"C:\Users\Admin\AppData\Local\Temp\tmpig727jvb.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3824
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "vtexgs41" /tr '"C:\Users\Admin\AppData\Roaming\vtexgs41.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3020
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "vtexgs41" /tr '"C:\Users\Admin\AppData\Roaming\vtexgs41.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4508
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6EA3.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4308
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4820
- - C:\Users\Admin\AppData\Roaming\vtexgs41.exe
    "C:\Users\Admin\AppData\Roaming\vtexgs41.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3884

C:\Users\Admin\AppData\Roaming\vtexgs41.exe
"C:\Users\Admin\AppData\Roaming\vtexgs41.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:5088

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

tmp6EA3.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp6EA3.tmp.bat
Size 152B
SHA256 506ad0a6b10400d815eacaadadb334e458d972df99f6875a7722df8af604ab7c
MD5 6bfd3ca9a022353a3eb7e84c24b6a802
SHA1 af0444430c303d0f7cb9dd0392933a591678deed
SHA512 96aeaf5862b7999b00040561fee68ac6f6a9e75970a641639c1198574092b2621bad334591e9132afc2b679758cf15c7dd4d2a94bae952dbdcea77de53a49f13
TLSH
T127C08C53A1C9AA0E6809145302BBA98CA1626C2D3F40AB40CB0C448A12C05A8F0AA241
MD5 SHA1 SHA512 TLSH

Submit Download

vtexgs41.exe

Path C:\Users\Admin\AppData\Roaming\vtexgs41.exe
Size 45KB
SHA256 52fe41a6d25b4da5a29b79b337479f0a11ec12b7b8ce7b6441c91f52f2498e3b
MD5 7a00991d2f92c7c437ad9b62ae342f44
SHA1 d403adab41189d005a5365fec186f14b3b493e1d
SHA512 0c977bbf281b368966817e6010911fd1c99565196569172cb9d01b8a3adef4a6b9968ac46c47f7555fa5264e623badea617e5f61de829437d05c29dcb95e793a
SSDEEP 768:RuxBJTVmU5EkWUGMKSmo2q1BuwZQaKkPIQzjbugX3iS8bMWMEBMacZRBDZcx:RuxBJTgip2IIQ3bRXS2WM4MaMdcx
TLSH
T1B123FA003BE9823BF2BE4FB868F26145857AF6636603D5492CC451DB1623FC69A426FD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3824-0-0x0000000000EF0000-0x0000000000F02000-memory.dmp

Download

memory/3824-1-0x0000000005890000-0x00000000058A0000-memory.dmp

Download

memory/3824-2-0x0000000005940000-0x00000000059DC000-memory.dmp

Download

memory/5088-10-0x0000000005250000-0x0000000005260000-memory.dmp

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memory/5088-13-0x0000000005250000-0x0000000005260000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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