asyncrat | 2f3aa123e38c045e4e01fcc3d3b3a5f00145fcdf046d7927b5ed3bdeacf8ff63

General

Target

FLXTOOL.exe
Size

63KB
MD5

faf1be9e62e7afb4621e01d6c4e027b1
SHA1

b66b0e1ac8702bae29c70f8b2224e3c5ed6efb91
SHA256

2f3aa123e38c045e4e01fcc3d3b3a5f00145fcdf046d7927b5ed3bdeacf8ff63
SHA512

1b946c629df260ac05090a1af1096ffb3508dbc8007cac63d37a63edd178770502de3ac4b3be6057972753e9bc60de75aebfb56cf17a8740f889489c1b804e4d
SSDEEP

1536:cYmHsfGV/tWnp4Ubfh9DFpOuEdpqKmY7:cYVfGV0p4Ubf1mGz

Score

10^/10

asyncrat flx rat

Malware Config

Extracted

Family

asyncrat

Botnet

Flx

C2

call-instructional.gl.at.ply.gg:61865

Attributes

delay
1
install
true
install_file
FLX.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/0x0008000000023ca2-11.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-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	FLXTOOL.exe

Executes dropped EXE 1 IoCs

pid	Process
4128	FLX.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3632	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
856	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe
1056	FLXTOOL.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1056	FLXTOOL.exe
Token: SeDebugPrivilege	1056	FLXTOOL.exe
Token: SeDebugPrivilege	4128	FLX.exe
Token: SeDebugPrivilege	4128	FLX.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1056 wrote to memory of 2860	1056	FLXTOOL.exe	83
PID 1056 wrote to memory of 2860	1056	FLXTOOL.exe	83
PID 1056 wrote to memory of 4416	1056	FLXTOOL.exe	85
PID 1056 wrote to memory of 4416	1056	FLXTOOL.exe	85
PID 4416 wrote to memory of 3632	4416	cmd.exe	87
PID 4416 wrote to memory of 3632	4416	cmd.exe	87
PID 2860 wrote to memory of 856	2860	cmd.exe	88
PID 2860 wrote to memory of 856	2860	cmd.exe	88
PID 4416 wrote to memory of 4128	4416	cmd.exe	89
PID 4416 wrote to memory of 4128	4416	cmd.exe	89

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\FLXTOOL.exe
"C:\Users\Admin\AppData\Local\Temp\FLXTOOL.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1056
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "FLX" /tr '"C:\Users\Admin\AppData\Roaming\FLX.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2860
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "FLX" /tr '"C:\Users\Admin\AppData\Roaming\FLX.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:856
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB4E8.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4416
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3632
- - C:\Users\Admin\AppData\Roaming\FLX.exe
    "C:\Users\Admin\AppData\Roaming\FLX.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:4128

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpB4E8.tmp.bat

Filesize
147B

MD5
2a31c8ffec8a5bb1b1f1ad4d15909a91

SHA1
c325e1119e3184eb57fc8a3d2db7fc6ebe3ed62d

SHA256
24c8ac6909f55366f527dc8f8a805fd8515f3c06dcd7747cb773dbee9e9b4c9a

SHA512
d484142359816e6174c4499868a4a6f8e46373ff6416d6b75368bf921bf9091d9a2f615825aa31f41a8c6e0bc4f5cd74df0cfa24ba0680449f57da50640e6806

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

Filesize
63KB

MD5
faf1be9e62e7afb4621e01d6c4e027b1

SHA1
b66b0e1ac8702bae29c70f8b2224e3c5ed6efb91

SHA256
2f3aa123e38c045e4e01fcc3d3b3a5f00145fcdf046d7927b5ed3bdeacf8ff63

SHA512
1b946c629df260ac05090a1af1096ffb3508dbc8007cac63d37a63edd178770502de3ac4b3be6057972753e9bc60de75aebfb56cf17a8740f889489c1b804e4d

Download Submit
memory/1056-0-0x00007FFC76C43000-0x00007FFC76C45000-memory.dmp

Filesize
8KB

Download
memory/1056-1-0x00000000009C0000-0x00000000009D6000-memory.dmp

Filesize
88KB

Download
memory/1056-2-0x00007FFC76C40000-0x00007FFC77701000-memory.dmp

Filesize
10.8MB

Download
memory/1056-3-0x00007FFC76C40000-0x00007FFC77701000-memory.dmp

Filesize
10.8MB

Download
memory/1056-8-0x00007FFC76C40000-0x00007FFC77701000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads