asyncrat | 9fde4361d7beadb8c11afed5b0518211740cef76ea03146e98a8337581e02f7e

General

Target

buidl.exe
Size

63KB
MD5

9c2d4871014553f542534fce03805000
SHA1

cd44e0ee979718203d896fcc7dcb5cc5077eb721
SHA256

9fde4361d7beadb8c11afed5b0518211740cef76ea03146e98a8337581e02f7e
SHA512

7d15b22083a0132440297035e5854b318e2aadc615c7959285bc8516292b19f7cd1b062350bde02397e562952ec0910100c4988bec2d92b4ca394b76b1bb7442
SSDEEP

768:PHDvlKazXYN78NwC8A+XuqazcBRL5JTk1+T4KSBGHmDbD/ph0oXOlKYsN3tlSusV:btTXA9dSJYUbdh9OlAF+usdpqKmY7

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

Attributes

delay
1
install
true
install_file
Discord.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/zs3YKzJ3

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
behavioral1/files/0x00080000000234bc-9.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-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	buidl.exe

Executes dropped EXE 1 IoCs

pid	Process
1436	Discord.exe

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

Web Service

T1102

flow	ioc
28	pastebin.com
29	pastebin.com

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
3996	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
3592	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe
1216	buidl.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1216	buidl.exe
Token: SeDebugPrivilege	1436	Discord.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1216 wrote to memory of 1440	1216	buidl.exe	87
PID 1216 wrote to memory of 1440	1216	buidl.exe	87
PID 1216 wrote to memory of 1708	1216	buidl.exe	89
PID 1216 wrote to memory of 1708	1216	buidl.exe	89
PID 1708 wrote to memory of 3996	1708	cmd.exe	92
PID 1708 wrote to memory of 3996	1708	cmd.exe	92
PID 1440 wrote to memory of 3592	1440	cmd.exe	91
PID 1440 wrote to memory of 3592	1440	cmd.exe	91
PID 1708 wrote to memory of 1436	1708	cmd.exe	94
PID 1708 wrote to memory of 1436	1708	cmd.exe	94

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\buidl.exe
"C:\Users\Admin\AppData\Local\Temp\buidl.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1216
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Discord" /tr '"C:\Users\Admin\AppData\Roaming\Discord.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1440
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Discord" /tr '"C:\Users\Admin\AppData\Roaming\Discord.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3592
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC813.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1708
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3996
- - C:\Users\Admin\AppData\Roaming\Discord.exe
    "C:\Users\Admin\AppData\Roaming\Discord.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:1436

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

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpC813.tmp.bat

Filesize
151B

MD5
38cfd04a419a844704f90abc089f4276

SHA1
ab22fa8058882bc3f43285c1210400035d8b0d5a

SHA256
b697dfe955f836290ac8752880d1fb2e478c39597db6d41332810cd1f5006b91

SHA512
ff44df5f3e504513b2ff51590e8a802ad29e1658fa88546f33afb784b90a7691c385c9f59892cc52f88fc98203fbd018a3ce1f880684f654472aa3c2b3625be6

Download Submit
C:\Users\Admin\AppData\Roaming\Discord.exe

Filesize
63KB

MD5
9c2d4871014553f542534fce03805000

SHA1
cd44e0ee979718203d896fcc7dcb5cc5077eb721

SHA256
9fde4361d7beadb8c11afed5b0518211740cef76ea03146e98a8337581e02f7e

SHA512
7d15b22083a0132440297035e5854b318e2aadc615c7959285bc8516292b19f7cd1b062350bde02397e562952ec0910100c4988bec2d92b4ca394b76b1bb7442

Download Submit
memory/1216-0-0x0000000000070000-0x0000000000086000-memory.dmp

Filesize
88KB

Download
memory/1216-1-0x00007FFAAD1A3000-0x00007FFAAD1A5000-memory.dmp

Filesize
8KB

Download
memory/1216-2-0x00007FFAAD1A0000-0x00007FFAADC61000-memory.dmp

Filesize
10.8MB

Download
memory/1216-7-0x00007FFAAD1A0000-0x00007FFAADC61000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads