asyncrat | 1df3112f5860f7536a54cb48b6293ff4bbffc317df1980fa64f85e62a5f8abb0

General

Target
team2.exe
Size 45KB
Sample260816-fd7mvabc76
SHA256 1df3112f5860f7536a54cb48b6293ff4bbffc317df1980fa64f85e62a5f8abb0
MD5 b1141ffa809c0604bbad4525375cbe13
SHA1 e4fad0f079f191b0944a7a612cd3c2d42a51d051
SHA512 da8399e2727ff9539539705ea8888d40c13526296f27328a436677192e951a2228009a2f79acb0bdef4b7c36b1347d8804a9301cae182912e0ec847811db7cb0
SSDEEP 768:Ju+M1TFNzX1WUV/DuPmo2qj13FoDEaOPIdzjbvgX3i2GahrTRqyGLBDZbx:Ju+M1TFlJ42mKEa3d3bYXSPaKdbx
TLSH
T125232B003BE8822BF2BE4F78ADF26145467AF5A37603D5492CC441D75A13FC69A42AFD
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

malkolak.in:6606
malkolak.in:7707
malkolak.in:8808
malkolak.in:80
malkolak.in:8080
malkolak.in:443
malkolak.in:8443
megasync.top:6606
megasync.top:7707
megasync.top:8808
megasync.top:80
megasync.top:8080
megasync.top:443
megasync.top:8443
98win.trendstoday.in:6606
98win.trendstoday.in:7707
98win.trendstoday.in:8808
98win.trendstoday.in:80
98win.trendstoday.in:8080
98win.trendstoday.in:443
98win.trendstoday.in:8443

Mutex

NppZAL5Jzr8X

Attributes

delay
3
install
true
install_file
GayLo.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/0x0008000000024324-9.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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	team2.exe

Executes dropped EXE 2 IoCs

pid	Process
4936	GayLo.exe
2392	GayLo.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
548	cmd.exe
3648	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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	GayLo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	GayLo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	team2.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1100	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
2796	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe
1284	team2.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1284	team2.exe
Token: SeDebugPrivilege	4936	GayLo.exe
Token: SeDebugPrivilege	4936	GayLo.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1284 wrote to memory of 548	1284	team2.exe	86
PID 1284 wrote to memory of 3648	1284	team2.exe	88
PID 3648 wrote to memory of 1100	3648	cmd.exe	90
PID 548 wrote to memory of 2796	548	cmd.exe	91
PID 3648 wrote to memory of 2392	3648	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\team2.exe
"C:\Users\Admin\AppData\Local\Temp\team2.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1284
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "GayLo" /tr '"C:\Users\Admin\AppData\Roaming\GayLo.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:548
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "GayLo" /tr '"C:\Users\Admin\AppData\Roaming\GayLo.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2796
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8364.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3648
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1100
- - C:\Users\Admin\AppData\Roaming\GayLo.exe
    "C:\Users\Admin\AppData\Roaming\GayLo.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2392

C:\Users\Admin\AppData\Roaming\GayLo.exe
"C:\Users\Admin\AppData\Roaming\GayLo.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4936

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

tmp8364.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp8364.tmp.bat
Size 149B
SHA256 dcd24dfdf74e760d4cd71f80bd69ebcf5a4fa5aa47f08edc24794a9a75e6067a
MD5 d8aac7992ed912240696bc02c8206a21
SHA1 5300a9306e1afa1ca8e58ec1b42012f7e504dfcb
SHA512 52bbf89b6149c66fa6fa433f1085b00fbdf3a6565073891277034155d24b4e0d774e4e1dfe3c72db9961f755a7ef715ceedafa5d7a2a940d80f82ba20bbd937c
TLSH
T143C02B4291C6FA4F7805682713FFD88DA173BC193F40BB10C30C805E1680849F0D9341
MD5 SHA1 SHA512 TLSH

Submit Download

GayLo.exe

Path C:\Users\Admin\AppData\Roaming\GayLo.exe
Size 45KB
SHA256 1df3112f5860f7536a54cb48b6293ff4bbffc317df1980fa64f85e62a5f8abb0
MD5 b1141ffa809c0604bbad4525375cbe13
SHA1 e4fad0f079f191b0944a7a612cd3c2d42a51d051
SHA512 da8399e2727ff9539539705ea8888d40c13526296f27328a436677192e951a2228009a2f79acb0bdef4b7c36b1347d8804a9301cae182912e0ec847811db7cb0
SSDEEP 768:Ju+M1TFNzX1WUV/DuPmo2qj13FoDEaOPIdzjbvgX3i2GahrTRqyGLBDZbx:Ju+M1TFlJ42mKEa3d3bYXSPaKdbx
TLSH
T125232B003BE8822BF2BE4F78ADF26145467AF5A37603D5492CC441D75A13FC69A42AFD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1284-0-0x0000000000380000-0x0000000000392000-memory.dmp

Download

memory/1284-1-0x0000000004DF0000-0x0000000004E00000-memory.dmp

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memory/1284-2-0x0000000004D10000-0x0000000004D76000-memory.dmp

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memory/1284-3-0x00000000051E0000-0x000000000527C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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