asyncrat | e87744178fba28b505eccbf4847a77f84877a8bd8f50ce17f5f6f68a0ea41327

General

Target

bro.exe
Size

47KB
MD5

83fc5776b79aad95fecd322f11f80187
SHA1

412ccb9ab9e743907eef7be3b47568decefbd15f
SHA256

e87744178fba28b505eccbf4847a77f84877a8bd8f50ce17f5f6f68a0ea41327
SHA512

1552e626f349c66f7e555326e68d97aa87a4971b6c4b912514f1bfa39036d17c9295e88e0f49c349cac2758974e060535044ea4d09a25f2949f45ab79f0c838b
SSDEEP

768:MuY69T3kH1jWUvTqRmo2qbRc4wmDPItjd0axq0bE6zrvtOoqJ/UBDZ0x:MuY69T34y2AwmMtjZHbE6/vgMd0x

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

desktop-ukmnq5d-wasda.at.remote.it:33006

Mutex

tTT9mCTiJnq9

Attributes

delay
3
install
true
install_file
roar.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x0008000000023c7c-11.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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	bro.exe

Executes dropped EXE 1 IoCs

pid	Process
1588	roar.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 6 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	roar.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bro.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4200	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
676	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe
4248	bro.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4248	bro.exe
Token: SeDebugPrivilege	1588	roar.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4248 wrote to memory of 5004	4248	bro.exe	85
PID 4248 wrote to memory of 5004	4248	bro.exe	85
PID 4248 wrote to memory of 5004	4248	bro.exe	85
PID 4248 wrote to memory of 2324	4248	bro.exe	87
PID 4248 wrote to memory of 2324	4248	bro.exe	87
PID 4248 wrote to memory of 2324	4248	bro.exe	87
PID 2324 wrote to memory of 4200	2324	cmd.exe	89
PID 2324 wrote to memory of 4200	2324	cmd.exe	89
PID 2324 wrote to memory of 4200	2324	cmd.exe	89
PID 5004 wrote to memory of 676	5004	cmd.exe	90
PID 5004 wrote to memory of 676	5004	cmd.exe	90
PID 5004 wrote to memory of 676	5004	cmd.exe	90
PID 2324 wrote to memory of 1588	2324	cmd.exe	91
PID 2324 wrote to memory of 1588	2324	cmd.exe	91
PID 2324 wrote to memory of 1588	2324	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\bro.exe
"C:\Users\Admin\AppData\Local\Temp\bro.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4248
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "roar" /tr '"C:\Users\Admin\AppData\Roaming\roar.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5004
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "roar" /tr '"C:\Users\Admin\AppData\Roaming\roar.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:676
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD031.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2324
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4200
- - C:\Users\Admin\AppData\Roaming\roar.exe
    "C:\Users\Admin\AppData\Roaming\roar.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1588

Network

MITRE ATT&CK Enterprise v15

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

C:\Users\Admin\AppData\Local\Temp\tmpD031.tmp.bat

Filesize
148B

MD5
d3e7a91a737b125cd47a31a5a9ae961e

SHA1
0c1b5639ca3948c83f797f927ae1eb65de44de46

SHA256
a108144b8117e0662f6db7f5a04e8ea6c608092654b91400aa7c71c954b6dfbf

SHA512
da3e8aef284e52bc872c53bf2272ce04ba7827e2fcce590990d2074193c4e400c297afabbbdcc8f12558a43229b2fdd6c718ff1dd0aeb1c55fc49030a1a9baad

Download Submit
C:\Users\Admin\AppData\Roaming\roar.exe

Filesize
47KB

MD5
83fc5776b79aad95fecd322f11f80187

SHA1
412ccb9ab9e743907eef7be3b47568decefbd15f

SHA256
e87744178fba28b505eccbf4847a77f84877a8bd8f50ce17f5f6f68a0ea41327

SHA512
1552e626f349c66f7e555326e68d97aa87a4971b6c4b912514f1bfa39036d17c9295e88e0f49c349cac2758974e060535044ea4d09a25f2949f45ab79f0c838b

Download Submit
memory/1588-13-0x0000000074570000-0x0000000074D20000-memory.dmp

Filesize
7.7MB

Download
memory/1588-14-0x0000000074570000-0x0000000074D20000-memory.dmp

Filesize
7.7MB

Download
memory/4248-0-0x000000007461E000-0x000000007461F000-memory.dmp

Filesize
4KB

Download
memory/4248-1-0x0000000000680000-0x0000000000692000-memory.dmp

Filesize
72KB

Download
memory/4248-2-0x0000000074610000-0x0000000074DC0000-memory.dmp

Filesize
7.7MB

Download
memory/4248-3-0x0000000005040000-0x00000000050DC000-memory.dmp

Filesize
624KB

Download
memory/4248-9-0x0000000074610000-0x0000000074DC0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads