asyncrat | 235acf44d2a24f518dc53f3eda92ffb9fbe2546c37d9e5fb951eb282c782f3c7

General

Target

0x00080000000174cc-13.exe
Size

74KB
MD5

5b43e7355fd90aff498f34f9c9abe5a0
SHA1

ced829ab27f09bb9316a95617e027dfa052f0955
SHA256

235acf44d2a24f518dc53f3eda92ffb9fbe2546c37d9e5fb951eb282c782f3c7
SHA512

a703c4e821e40361b1da8a1687fbb7e394efa81c19e386f0037b1380e1949f58219cf0b69e8ec1eee068a7cf5667c933437a3382e2f1cc9f20b438df3b35a5c0
SSDEEP

1536:mU5gcxbVzCt+PPMVFsg/IuH1bG/eASUDUxQzcKLVclN:mUGcxblTPPMVFjDH1bGRNUxQ7BY

Score

10^/10

asyncrat venomrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

Tsurugi RATs

Botnet

Default

C2

213.136.90.188:4449

Mutex

zteprqyjlfgxrxuaid

Attributes

delay
1
install
true
install_file
Check Windows Update.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

VenomRAT 3 IoCs

Detects VenomRAT.

rat

resource	yara_rule
behavioral1/memory/2440-1-0x0000000000F30000-0x0000000000F48000-memory.dmp	VenomRAT
behavioral1/files/0x0035000000016c3d-16.dat	VenomRAT
behavioral1/memory/2680-18-0x0000000000040000-0x0000000000058000-memory.dmp	VenomRAT

Venomrat family
venomrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x0035000000016c3d-16.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2680	Check Windows Update.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
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
2184	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
2660	schtasks.exe

Suspicious behavior: EnumeratesProcesses 38 IoCs

pid	Process
2440	0x00080000000174cc-13.exe
2440	0x00080000000174cc-13.exe
2440	0x00080000000174cc-13.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe
2680	Check Windows Update.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2440	0x00080000000174cc-13.exe
Token: SeDebugPrivilege	2680	Check Windows Update.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2680	Check Windows Update.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2440 wrote to memory of 2744	2440	0x00080000000174cc-13.exe	30
PID 2440 wrote to memory of 2744	2440	0x00080000000174cc-13.exe	30
PID 2440 wrote to memory of 2744	2440	0x00080000000174cc-13.exe	30
PID 2440 wrote to memory of 2700	2440	0x00080000000174cc-13.exe	31
PID 2440 wrote to memory of 2700	2440	0x00080000000174cc-13.exe	31
PID 2440 wrote to memory of 2700	2440	0x00080000000174cc-13.exe	31
PID 2744 wrote to memory of 2660	2744	cmd.exe	34
PID 2744 wrote to memory of 2660	2744	cmd.exe	34
PID 2744 wrote to memory of 2660	2744	cmd.exe	34
PID 2700 wrote to memory of 2184	2700	cmd.exe	35
PID 2700 wrote to memory of 2184	2700	cmd.exe	35
PID 2700 wrote to memory of 2184	2700	cmd.exe	35
PID 2700 wrote to memory of 2680	2700	cmd.exe	36
PID 2700 wrote to memory of 2680	2700	cmd.exe	36
PID 2700 wrote to memory of 2680	2700	cmd.exe	36

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\0x00080000000174cc-13.exe
"C:\Users\Admin\AppData\Local\Temp\0x00080000000174cc-13.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2440
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Check Windows Update" /tr '"C:\Users\Admin\AppData\Roaming\Check Windows Update.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2744
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Check Windows Update" /tr '"C:\Users\Admin\AppData\Roaming\Check Windows Update.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2660
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp5B0B.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2700
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2184
- - C:\Users\Admin\AppData\Roaming\Check Windows Update.exe
    "C:\Users\Admin\AppData\Roaming\Check Windows Update.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:2680

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

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\Cab6E11.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar7F52.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp5B0B.tmp.bat

Filesize
164B

MD5
7bd28c867bb082732333900cf622c165

SHA1
46358f709c1151b31cf097f3acf97c2f8cc7b278

SHA256
44d0216004e64d99cc234722064bb03073593f6b12dcc61fff3b9436e7e66b35

SHA512
903885c8fb90817666da15c1e585670fafcb5d77a8a044d7cee4001f140a247575a79e6e9c931c07773a274871ce0d992df476461bd5291d1714d81425b63dcf

Download Submit
C:\Users\Admin\AppData\Roaming\Check Windows Update.exe

Filesize
74KB

MD5
5b43e7355fd90aff498f34f9c9abe5a0

SHA1
ced829ab27f09bb9316a95617e027dfa052f0955

SHA256
235acf44d2a24f518dc53f3eda92ffb9fbe2546c37d9e5fb951eb282c782f3c7

SHA512
a703c4e821e40361b1da8a1687fbb7e394efa81c19e386f0037b1380e1949f58219cf0b69e8ec1eee068a7cf5667c933437a3382e2f1cc9f20b438df3b35a5c0

Download Submit
C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf

Filesize
8B

MD5
cf759e4c5f14fe3eec41b87ed756cea8

SHA1
c27c796bb3c2fac929359563676f4ba1ffada1f5

SHA256
c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761

SHA512
c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

Download Submit
memory/2440-0-0x000007FEF55D3000-0x000007FEF55D4000-memory.dmp

Filesize
4KB

Download
memory/2440-1-0x0000000000F30000-0x0000000000F48000-memory.dmp

Filesize
96KB

Download
memory/2440-3-0x000007FEF55D0000-0x000007FEF5FBC000-memory.dmp

Filesize
9.9MB

Download
memory/2440-11-0x000007FEF55D0000-0x000007FEF5FBC000-memory.dmp

Filesize
9.9MB

Download
memory/2440-13-0x000007FEF55D0000-0x000007FEF5FBC000-memory.dmp

Filesize
9.9MB

Download
memory/2680-18-0x0000000000040000-0x0000000000058000-memory.dmp

Filesize
96KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads