asyncrat | 747957c357cf6fbb4507831926d64211bcea32f767e4262efe275bba99154089

Analysis

max time kernel
454s
max time network
591s
platform
windows10-2004_x64
resource
win10v2004-20240419-en
resource tags

arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
submitted
03/05/2024, 01:40

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General

Target
a ton of cumme/cumme - Copy.exe
Size 63KB
Sample240503-b3vmcsbh5w
SHA256 390f2329d720595861f5bc5bf65cccdd0a76639197f15fb1529e66736a6f6a41
MD5 76034e5a2c3a49ec8232f011d5572d84
SHA1 9dae727f33662a0411fb0f49a51c845fddbb5b98
SHA512 df4a742d9f5da89888a154f4eef3964bf5574f4d679088aa03fc58e8309f06ea942ea291fa2acd87e92c922c59845c1b695d9dd736e3f7b99316c08dd6968a1d
SSDEEP 1536:AqTQa7NVNPHYUYUbzh97IBfusdpqKmY7:A5ANVHYUbz3kJGz
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

other-fellow.gl.at.ply.gg:42571

Attributes

delay
1
install
true
install_file
cumme.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
behavioral31/files/0x0011000000023a11-10.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-1-5-21-877519540-908060166-1852957295-1000\Control Panel\International\Geo\Nation	cumme - Copy.exe

Executes dropped EXE 1 IoCs

pid	Process
4124	cumme.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
1908	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4084	timeout.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe
1648	cumme - Copy.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1648	cumme - Copy.exe
Token: SeDebugPrivilege	4124	cumme.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1648 wrote to memory of 2632	1648	cumme - Copy.exe	87
PID 1648 wrote to memory of 2632	1648	cumme - Copy.exe	87
PID 1648 wrote to memory of 2240	1648	cumme - Copy.exe	89
PID 1648 wrote to memory of 2240	1648	cumme - Copy.exe	89
PID 2240 wrote to memory of 4084	2240	cmd.exe	92
PID 2240 wrote to memory of 4084	2240	cmd.exe	92
PID 2632 wrote to memory of 1908	2632	cmd.exe	91
PID 2632 wrote to memory of 1908	2632	cmd.exe	91
PID 2240 wrote to memory of 4124	2240	cmd.exe	98
PID 2240 wrote to memory of 4124	2240	cmd.exe	98

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\a ton of cumme\cumme - Copy.exe
"C:\Users\Admin\AppData\Local\Temp\a ton of cumme\cumme - Copy.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1648
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "cumme" /tr '"C:\Users\Admin\AppData\Roaming\cumme.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2632
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "cumme" /tr '"C:\Users\Admin\AppData\Roaming\cumme.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:1908
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4258.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2240
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4084
- - C:\Users\Admin\AppData\Roaming\cumme.exe
    "C:\Users\Admin\AppData\Roaming\cumme.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:4124

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

Exfiltration

Impact

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Downloads

tmp4258.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp4258.tmp.bat
Size 149B
SHA256 4ac2e77a08f814b85988212334bc65a4774d7252f045a1b3a57198f1d568bb1c
MD5 a4dbdc8826e0ea45f0b97b732835f485
SHA1 0be2e9fcb3badbe6329f782f17a5ad419b193226
SHA512 d638ecf7293364397a2e43092f024c1aa339585f82b6b316dc3d8ef39eb6f7c02923695dac10266b437f1a44e4cfdb5ce98ed3680350183d39b6de4acef208ff
MD5 SHA1 SHA512

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cumme.exe

Path C:\Users\Admin\AppData\Roaming\cumme.exe
Size 63KB
SHA256 390f2329d720595861f5bc5bf65cccdd0a76639197f15fb1529e66736a6f6a41
MD5 76034e5a2c3a49ec8232f011d5572d84
SHA1 9dae727f33662a0411fb0f49a51c845fddbb5b98
SHA512 df4a742d9f5da89888a154f4eef3964bf5574f4d679088aa03fc58e8309f06ea942ea291fa2acd87e92c922c59845c1b695d9dd736e3f7b99316c08dd6968a1d
SSDEEP 1536:AqTQa7NVNPHYUYUbzh97IBfusdpqKmY7:A5ANVHYUbz3kJGz
MD5 SHA1 SHA512 SSDEEP

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memory/1648-0-0x00000000009C0000-0x00000000009D6000-memory.dmp

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memory/1648-1-0x00007FFB62963000-0x00007FFB62965000-memory.dmp

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memory/1648-2-0x00007FFB62960000-0x00007FFB63421000-memory.dmp

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memory/1648-7-0x00007FFB62960000-0x00007FFB63421000-memory.dmp

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