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
behavioral1/files/0x0007000000018761-15.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2824	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
2404	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
2716	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2368	FLXTOOL.exe
2368	FLXTOOL.exe
2368	FLXTOOL.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2368	FLXTOOL.exe
Token: SeDebugPrivilege	2368	FLXTOOL.exe
Token: SeDebugPrivilege	2824	FLX.exe
Token: SeDebugPrivilege	2824	FLX.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2368 wrote to memory of 2668	2368	FLXTOOL.exe	32
PID 2368 wrote to memory of 2668	2368	FLXTOOL.exe	32
PID 2368 wrote to memory of 2668	2368	FLXTOOL.exe	32
PID 2368 wrote to memory of 2788	2368	FLXTOOL.exe	34
PID 2368 wrote to memory of 2788	2368	FLXTOOL.exe	34
PID 2368 wrote to memory of 2788	2368	FLXTOOL.exe	34
PID 2788 wrote to memory of 2404	2788	cmd.exe	36
PID 2788 wrote to memory of 2404	2788	cmd.exe	36
PID 2788 wrote to memory of 2404	2788	cmd.exe	36
PID 2668 wrote to memory of 2716	2668	cmd.exe	37
PID 2668 wrote to memory of 2716	2668	cmd.exe	37
PID 2668 wrote to memory of 2716	2668	cmd.exe	37
PID 2788 wrote to memory of 2824	2788	cmd.exe	38
PID 2788 wrote to memory of 2824	2788	cmd.exe	38
PID 2788 wrote to memory of 2824	2788	cmd.exe	38

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⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2368
- 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:2668
- - 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:2716
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpCACE.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2788
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2404
- - C:\Users\Admin\AppData\Roaming\FLX.exe
    "C:\Users\Admin\AppData\Roaming\FLX.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:2824

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

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
147B

MD5
dad29a8576ce91b28121a16d1702e5b7

SHA1
47fd42ef633ae2ef135fdd91883ba0715796dcf5

SHA256
1a81263ec57fd1c0fb98ff5ee9dbd6807a6738d227452872f638d56fb93dffb3

SHA512
00e21d80e51feed83ba8e3c715d9de69e1127d1fb0ccc032fdeef60917929eb9415baca500236cb6199a8fca28f1d5915bded4db76ec67fdd9f386407a3f7b86

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

Filesize
63KB

MD5
faf1be9e62e7afb4621e01d6c4e027b1

SHA1
b66b0e1ac8702bae29c70f8b2224e3c5ed6efb91

SHA256
2f3aa123e38c045e4e01fcc3d3b3a5f00145fcdf046d7927b5ed3bdeacf8ff63

SHA512
1b946c629df260ac05090a1af1096ffb3508dbc8007cac63d37a63edd178770502de3ac4b3be6057972753e9bc60de75aebfb56cf17a8740f889489c1b804e4d

Download Submit
memory/2368-0-0x000007FEF5983000-0x000007FEF5984000-memory.dmp

Filesize
4KB

Download
memory/2368-1-0x0000000000A40000-0x0000000000A56000-memory.dmp

Filesize
88KB

Download
memory/2368-2-0x000007FEF5980000-0x000007FEF636C000-memory.dmp

Filesize
9.9MB

Download
memory/2368-3-0x000007FEF5980000-0x000007FEF636C000-memory.dmp

Filesize
9.9MB

Download
memory/2368-13-0x000007FEF5980000-0x000007FEF636C000-memory.dmp

Filesize
9.9MB

Download
memory/2824-17-0x00000000002B0000-0x00000000002C6000-memory.dmp

Filesize
88KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads