asyncrat | 87078c9171d9dc9eed72e3e79b0ecbe38944b8c9ff479f4251d630e93191d3ce

General

Target
AsyncRAT.exe
Size 56KB
Sample260910-rx9r4avdph
SHA256 87078c9171d9dc9eed72e3e79b0ecbe38944b8c9ff479f4251d630e93191d3ce
MD5 858d92fd1f83cb346379c18236703bdc
SHA1 5ec457afd6ea489ddac44a23d2249f0a004482e2
SHA512 6a4fe34a75234347792a7f162dd10fbf2e9eeb7e56b1fec21c71dd330ce3fd38c21ce46950e992df4b53e617cc00a5358a66e0b3a8ec8c36988185134e14e623
SSDEEP 1536:2uf09TH2w240YikbeXS2yztG6OdNkejNUHLTq:2ufoTH2w2pYikbengADkINmq
TLSH
T18F436C0037E9822BF1BE4FB8ACF22145867AF2676603E55D2CC451DB5713BC6CA426F9
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

sexviet100.com:443
sexviet100.com:8848
sexviet100.com:8080

Mutex

kBVPjakHQ19X

Attributes

delay
3
install
true
install_file
AsyncRat.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/0x000a000000024325-8.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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	AsyncRAT.exe

Executes dropped EXE 2 IoCs

pid	Process
1412	AsyncRat.exe
1588	AsyncRat.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
4752	cmd.exe
1180	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	AsyncRat.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncRat.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncRAT.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

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4608	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
4936	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe
3552	AsyncRAT.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3552	AsyncRAT.exe
Token: SeDebugPrivilege	1412	AsyncRat.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3552 wrote to memory of 4752	3552	AsyncRAT.exe	85
PID 3552 wrote to memory of 1180	3552	AsyncRAT.exe	87
PID 1180 wrote to memory of 4608	1180	cmd.exe	89
PID 4752 wrote to memory of 4936	4752	cmd.exe	90
PID 1180 wrote to memory of 1588	1180	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\AsyncRAT.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncRAT.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3552
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "AsyncRat" /tr '"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4752
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "AsyncRat" /tr '"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4936
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp94E8.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1180
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4608
- - C:\Users\Admin\AppData\Roaming\AsyncRat.exe
    "C:\Users\Admin\AppData\Roaming\AsyncRat.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1588

C:\Users\Admin\AppData\Roaming\AsyncRat.exe
"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1412

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

AsyncRat.exe.log

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

Submit Download

tmp94E8.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp94E8.tmp.bat
Size 152B
SHA256 ee555e3fa537070afc7af07efaaa7863f287b0ee413b0f9605bd3c541207d3d8
MD5 4f99edb606b1ab34579b3a117c16e605
SHA1 9cf11619314a216f226a33d5e146d98a5423ad24
SHA512 0a26f05688fd1d87b303a53d9eb693f72c4d87ef4fd7a3604beb76232d63bdd5217dfeb4b234d839a257121dc3aaeddf6bfcdce562c490be7e87ff1fc3843e2f
TLSH
T127C02B42B2C5EB1F2C09381313FADD8C91B66C593F40BB54C30844EE128054CF0E9341
MD5 SHA1 SHA512 TLSH

Submit Download

AsyncRat.exe

Path C:\Users\Admin\AppData\Roaming\AsyncRat.exe
Size 56KB
SHA256 87078c9171d9dc9eed72e3e79b0ecbe38944b8c9ff479f4251d630e93191d3ce
MD5 858d92fd1f83cb346379c18236703bdc
SHA1 5ec457afd6ea489ddac44a23d2249f0a004482e2
SHA512 6a4fe34a75234347792a7f162dd10fbf2e9eeb7e56b1fec21c71dd330ce3fd38c21ce46950e992df4b53e617cc00a5358a66e0b3a8ec8c36988185134e14e623
SSDEEP 1536:2uf09TH2w240YikbeXS2yztG6OdNkejNUHLTq:2ufoTH2w2pYikbengADkINmq
TLSH
T18F436C0037E9822BF1BE4FB8ACF22145867AF2676603E55D2CC451DB5713BC6CA426F9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3552-0-0x0000000000C10000-0x0000000000C24000-memory.dmp

Download

memory/3552-1-0x00000000055B0000-0x00000000055C0000-memory.dmp

Download

memory/3552-2-0x0000000005660000-0x00000000056FC000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads