asyncrat | 48429db29ff42c7c50264ca1645560f5ca4e2a3e0f934dd59a06572c7770e7e7

Analysis

max time kernel
150s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
16/06/2024, 17:46

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General

Target

FlySide.exe
Size

234KB
MD5

0f582a0b2557f50a4745751a4c128c34
SHA1

894660b4a64e8309393f08f686cade8721dc5f73
SHA256

48429db29ff42c7c50264ca1645560f5ca4e2a3e0f934dd59a06572c7770e7e7
SHA512

b1c860bbae77ac8642bf1fb7963606b64d74b7ceb7e28d262b3cb2ae8a2e843aa22bfc18cc4882df1e83e58009205805452a412eddcd87615a6b3fb5802fab34
SSDEEP

1536:WpN/jdSJYUbdh9TV4uHaeQKKKKKKKKb4NMjB8X9C+VdpqKmY7:WTjYYUbdfaepMjOXc+VGz

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

127.0.0.1:3232

Attributes

delay
1
install
true
install_file
Winrar.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/0x000c000000023386-10.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-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	FlySide.exe

Executes dropped EXE 1 IoCs

pid	Process
3288	Winrar.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
2084	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4836	timeout.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3920	FlySide.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe
3288	Winrar.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3920	FlySide.exe
Token: SeDebugPrivilege	3288	Winrar.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3920 wrote to memory of 3568	3920	FlySide.exe	86
PID 3920 wrote to memory of 3568	3920	FlySide.exe	86
PID 3920 wrote to memory of 1892	3920	FlySide.exe	88
PID 3920 wrote to memory of 1892	3920	FlySide.exe	88
PID 1892 wrote to memory of 4836	1892	cmd.exe	90
PID 1892 wrote to memory of 4836	1892	cmd.exe	90
PID 3568 wrote to memory of 2084	3568	cmd.exe	91
PID 3568 wrote to memory of 2084	3568	cmd.exe	91
PID 1892 wrote to memory of 3288	1892	cmd.exe	92
PID 1892 wrote to memory of 3288	1892	cmd.exe	92

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\FlySide.exe
"C:\Users\Admin\AppData\Local\Temp\FlySide.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3920
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Winrar" /tr '"C:\Users\Admin\AppData\Roaming\Winrar.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3568
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Winrar" /tr '"C:\Users\Admin\AppData\Roaming\Winrar.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:2084
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4C2C.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1892
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4836
- - C:\Users\Admin\AppData\Roaming\Winrar.exe
    "C:\Users\Admin\AppData\Roaming\Winrar.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3288

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

C:\Users\Admin\AppData\Local\Temp\tmp4C2C.tmp.bat

Filesize
150B

MD5
cf837f9324105170a5b098ee74d79a24

SHA1
fca413ccd1ea743fa88ae5394e285802516f30b6

SHA256
27b958a7b56ee8df3798e753e91a8668c0cdded01d62e215fa5fe5a0870ab838

SHA512
ddf3c71dcf87b34a3cb455e90e9a87565751f5dc53c2e949c5c3a7a8a2e0dba81b497f71c89af912e64236ee9dc0b21e218cb1500e0b9eb8ba302c5d93b6457c

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

Filesize
234KB

MD5
0f582a0b2557f50a4745751a4c128c34

SHA1
894660b4a64e8309393f08f686cade8721dc5f73

SHA256
48429db29ff42c7c50264ca1645560f5ca4e2a3e0f934dd59a06572c7770e7e7

SHA512
b1c860bbae77ac8642bf1fb7963606b64d74b7ceb7e28d262b3cb2ae8a2e843aa22bfc18cc4882df1e83e58009205805452a412eddcd87615a6b3fb5802fab34

Download Submit
memory/3920-0-0x00007FFDE63E3000-0x00007FFDE63E5000-memory.dmp

Filesize
8KB

Download
memory/3920-1-0x00000000000A0000-0x00000000000E0000-memory.dmp

Filesize
256KB

Download
memory/3920-2-0x00007FFDE63E0000-0x00007FFDE6EA1000-memory.dmp

Filesize
10.8MB

Download
memory/3920-7-0x00007FFDE63E0000-0x00007FFDE6EA1000-memory.dmp

Filesize
10.8MB

Download