asyncrat | 747957c357cf6fbb4507831926d64211bcea32f767e4262efe275bba99154089

Analysis

max time kernel
451s
max time network
600s
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 (11).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
behavioral2/files/0x0005000000022ab3-10.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-1-5-21-3726321484-1950364574-433157660-1000\Control Panel\International\Geo\Nation	cumme - Copy (11).exe

Executes dropped EXE 1 IoCs

pid	Process
4784	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
620	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4540	timeout.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe
116	cumme - Copy (11).exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	116	cumme - Copy (11).exe
Token: SeDebugPrivilege	4784	cumme.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 116 wrote to memory of 3272	116	cumme - Copy (11).exe	87
PID 116 wrote to memory of 3272	116	cumme - Copy (11).exe	87
PID 116 wrote to memory of 4272	116	cumme - Copy (11).exe	89
PID 116 wrote to memory of 4272	116	cumme - Copy (11).exe	89
PID 4272 wrote to memory of 4540	4272	cmd.exe	91
PID 4272 wrote to memory of 4540	4272	cmd.exe	91
PID 3272 wrote to memory of 620	3272	cmd.exe	92
PID 3272 wrote to memory of 620	3272	cmd.exe	92
PID 4272 wrote to memory of 4784	4272	cmd.exe	99
PID 4272 wrote to memory of 4784	4272	cmd.exe	99

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 (11).exe
"C:\Users\Admin\AppData\Local\Temp\a ton of cumme\cumme - Copy (11).exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:116
- 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:3272
- - 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:620
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3F5B.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4272
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4540
- - C:\Users\Admin\AppData\Roaming\cumme.exe
    "C:\Users\Admin\AppData\Roaming\cumme.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:4784

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

tmp3F5B.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp3F5B.tmp.bat
Size 149B
SHA256 1c15ef679f2ec2cc7d3b34362242ab5379735600c5400e7b7567b64d20f47eff
MD5 55d0689d944dea7b7e2d49c4f9ce9a66
SHA1 fcd3b5b518758a14fe452f07770cb0e7f0576d83
SHA512 6d47e8f3115875f52d0e3fa58e9108b36178ca8bdfad393437df39110056da624ba6f7211209467d4fc2c34f83d1523878a6f904e7473db1f8779180fc3693bb
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/116-1-0x0000000000C20000-0x0000000000C36000-memory.dmp

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memory/116-0-0x00007FFECF043000-0x00007FFECF045000-memory.dmp

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memory/116-2-0x00007FFECF040000-0x00007FFECFB01000-memory.dmp

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memory/116-7-0x00007FFECF040000-0x00007FFECFB01000-memory.dmp

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