asyncrat | fcd03b493c7d33d9da6c27cd4569e53f70d18bf2e34cee700fa1ebdee266f193

General

Target
oalsdasndm.exe
Size 45KB
Sample260804-bheqeaae56
SHA256 fcd03b493c7d33d9da6c27cd4569e53f70d18bf2e34cee700fa1ebdee266f193
MD5 ca7ad2b7c3f5864f2c84df8c92ba9077
SHA1 8ba8a2a6af6642d6e8589cc75e9cf236aec55204
SHA512 ab4d8fe0d9cca6341dc67a747f9a6be672479298e711cf5e225e05b3fd40b8bb42e0191caf4712f0b67e1e749f8793bb4bc9fa9c623b831eebb36f05264743fb
SSDEEP 768:5u1PVT1IbSHWU7PyFmo2q4mE4LwPEUKOPIBzjbwgz3if+edDYazfgpOazBDZLx:5u1PVT1AL2ivgq3B3b3zSftCkuVdLx
TLSH
T151230A003BE9812BF2BE4F789DF26145867AE2632603D68D2CC441DB5713FC696526EE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

admin defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Admin

C2

tatuajesparahombres.co/vi-vn/:80
tatuajesparahombres.co/vi-vn/:443
tatuajesparahombres.co/vi-vn/:7788
tatuajesparahombres.co/vi-vn/:7879
tatuajesparahombres.co/vi-vn/:3577
tatuajesparahombres.co/:80
tatuajesparahombres.co/:443
tatuajesparahombres.co/:7788
tatuajesparahombres.co/:7879
tatuajesparahombres.co/:3577
www.tatuajesparahombres.co/:80
www.tatuajesparahombres.co/:443
www.tatuajesparahombres.co/:7788
www.tatuajesparahombres.co/:7879
www.tatuajesparahombres.co/:3577

Mutex

CSjSud5EUtxN

Attributes

delay
3
install
true
install_file
oalsdasndm.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/0x000800000002435e-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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	oalsdasndm.exe

Executes dropped EXE 2 IoCs

pid	Process
3668	oalsdasndm.exe
4260	oalsdasndm.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
4820	cmd.exe
5052	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	oalsdasndm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	oalsdasndm.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	oalsdasndm.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3100	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
3232	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe
4420	oalsdasndm.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4420	oalsdasndm.exe
Token: SeDebugPrivilege	3668	oalsdasndm.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4420 wrote to memory of 4820	4420	oalsdasndm.exe	86
PID 4420 wrote to memory of 5052	4420	oalsdasndm.exe	88
PID 5052 wrote to memory of 3100	5052	cmd.exe	90
PID 4820 wrote to memory of 3232	4820	cmd.exe	91
PID 5052 wrote to memory of 4260	5052	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\oalsdasndm.exe
"C:\Users\Admin\AppData\Local\Temp\oalsdasndm.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4420
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "oalsdasndm" /tr '"C:\Users\Admin\AppData\Roaming\oalsdasndm.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4820
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "oalsdasndm" /tr '"C:\Users\Admin\AppData\Roaming\oalsdasndm.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3232
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4BC9.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5052
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3100
- - C:\Users\Admin\AppData\Roaming\oalsdasndm.exe
    "C:\Users\Admin\AppData\Roaming\oalsdasndm.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4260

C:\Users\Admin\AppData\Roaming\oalsdasndm.exe
"C:\Users\Admin\AppData\Roaming\oalsdasndm.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3668

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

Replay Monitor

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Downloads

oalsdasndm.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\oalsdasndm.exe.log
Size 522B
SHA256 2412679218bb0a7d05ceee32869bbb223619bde9966c4c460a68304a3367724b
MD5 acc9090417037dfa2a55b46ed86e32b8
SHA1 53fa6fb25fb3e88c24d2027aca6ae492b2800a4d
SHA512 d51f7085ec147c708f446b9fb6923cd2fb64596d354ed929e125b30ace57c8cb3217589447a36960e5d3aea87a4e48aaa82c7509eced6d6c2cecd71fcfe3697b
TLSH
T11EF097303722E1E489423F521C1C3A9943EF079AA360EE2C3958036ED825227AB212E3
MD5 SHA1 SHA512 TLSH

Submit Download

tmp4BC9.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp4BC9.tmp.bat
Size 154B
SHA256 10a7e0b01086bedbb99465488cd845badaf00c9ab17ce8207873ebdbe3f97fdb
MD5 276e466d747623caebe37e95820735b2
SHA1 1b63eae7cbbd2459b6957bfb8c82a91653624041
SHA512 ece436eb4d90bf3a63f1ad9cd66dda1bcdb442bcd9f497cc64793b34fa83f86d66face971f26a958d72d8eb46021957f6467f9c5b947e439412eda640140b3ae
TLSH
T187C02B4251C6FA1E3C45641302FBD58E96B26D1E3F45FF10D704444D1280C88F0DE342
MD5 SHA1 SHA512 TLSH

Submit Download

oalsdasndm.exe

Path C:\Users\Admin\AppData\Roaming\oalsdasndm.exe
Size 45KB
SHA256 fcd03b493c7d33d9da6c27cd4569e53f70d18bf2e34cee700fa1ebdee266f193
MD5 ca7ad2b7c3f5864f2c84df8c92ba9077
SHA1 8ba8a2a6af6642d6e8589cc75e9cf236aec55204
SHA512 ab4d8fe0d9cca6341dc67a747f9a6be672479298e711cf5e225e05b3fd40b8bb42e0191caf4712f0b67e1e749f8793bb4bc9fa9c623b831eebb36f05264743fb
SSDEEP 768:5u1PVT1IbSHWU7PyFmo2q4mE4LwPEUKOPIBzjbwgz3if+edDYazfgpOazBDZLx:5u1PVT1AL2ivgq3B3b3zSftCkuVdLx
TLSH
T151230A003BE9812BF2BE4F789DF26145867AE2632603D68D2CC441DB5713FC696526EE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4420-0-0x0000000000860000-0x0000000000872000-memory.dmp

Download

memory/4420-1-0x0000000005390000-0x00000000053A0000-memory.dmp

Download

memory/4420-2-0x0000000005280000-0x000000000531C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads