asyncrat | 747957c357cf6fbb4507831926d64211bcea32f767e4262efe275bba99154089

Analysis

max time kernel
453s
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.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
behavioral32/files/0x000b000000023b8c-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-1-5-21-2818691465-3043947619-2475182763-1000\Control Panel\International\Geo\Nation	cumme.exe

Executes dropped EXE 1 IoCs

pid	Process
3116	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
2572	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1540	timeout.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe
4900	cumme.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4900	cumme.exe
Token: SeDebugPrivilege	3116	cumme.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4900 wrote to memory of 808	4900	cumme.exe	86
PID 4900 wrote to memory of 808	4900	cumme.exe	86
PID 4900 wrote to memory of 3892	4900	cumme.exe	88
PID 4900 wrote to memory of 3892	4900	cumme.exe	88
PID 808 wrote to memory of 2572	808	cmd.exe	90
PID 808 wrote to memory of 2572	808	cmd.exe	90
PID 3892 wrote to memory of 1540	3892	cmd.exe	91
PID 3892 wrote to memory of 1540	3892	cmd.exe	91
PID 3892 wrote to memory of 3116	3892	cmd.exe	99
PID 3892 wrote to memory of 3116	3892	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.exe
"C:\Users\Admin\AppData\Local\Temp\a ton of cumme\cumme.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4900
- 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:808
- - 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:2572
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3D28.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3892
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1540
- - C:\Users\Admin\AppData\Roaming\cumme.exe
    "C:\Users\Admin\AppData\Roaming\cumme.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:3116

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

cumme.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\cumme.exe.log
Size 425B
SHA256 b8f7e4ed81764db56b9c09050f68c5a26af78d8a5e2443e75e0e1aa7cd2ccd76
MD5 fff5cbccb6b31b40f834b8f4778a779a
SHA1 899ed0377e89f1ed434cfeecc5bc0163ebdf0454
SHA512 1a188a14c667bc31d2651b220aa762be9cce4a75713217846fbe472a307c7bbc6e3c27617f75f489902a534d9184648d204d03ee956ac57b11aa90551248b8f9
MD5 SHA1 SHA512

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tmp3D28.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp3D28.tmp.bat
Size 149B
SHA256 f1b2a5b998e089970cda1121827e5492f3db7a56177a7a9aa33497f518e1c21c
MD5 0cfbf8d5685b6d2c2a4491d2043e4937
SHA1 5e0f9ac58baf57b49da887d4f2302c8db30b2c35
SHA512 6e65a9834235a948b862eec509d19804bc120ccb859a25e44afaf4d138289097935bc1913069fd19489c4e67a3b028fee0b08949ae978b2157431b44dd45faa5
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/4900-0-0x0000000000F10000-0x0000000000F26000-memory.dmp

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memory/4900-1-0x00007FF93FD83000-0x00007FF93FD85000-memory.dmp

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memory/4900-2-0x00007FF93FD80000-0x00007FF940841000-memory.dmp

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memory/4900-7-0x00007FF93FD80000-0x00007FF940841000-memory.dmp

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memory/4900-15-0x00007FF93FD80000-0x00007FF940841000-memory.dmp

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