asyncrat | 496146365c8463d0e5d895c076dec36cd70968464dbfec8d64cb37c89eb9d6b7

Analysis

max time kernel
136s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
18-05-2024 13:36

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General

Target

sample.exe
Size

407KB
MD5

3de308db811bdd3781a51a313d6d179f
SHA1

0118e47f8bd38d3ed43cfed441f7047938490cf8
SHA256

7778fbb8ef5a6e0948d5135dc4dc9136cb16a56d6ac933f72ae66aef7151d989
SHA512

07a1b4f088b4aef42eed545b2f836d1a1f97a418e532ef69d4b68e1a8fa9cf9b8fa1dbf97c8fa9b9a9230555a2193881d746f529ef17ddc6b65d499d09100b49
SSDEEP

6144:jRwuOnmWW0hQAYRc0ZL8uOQIbY7aSzHA39GMQNe5TdjXmGWpWX2/iE:+mX0fYW0ZLxZGY7aSMsLNeBVmrj

Score

10^/10

asyncrat default persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

54.75.82.184:7206

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
false
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

sample.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Local\\Temp\\sample.exe\""	sample.exe

Drops startup file 2 IoCs

Processes:

sample.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sample.exe	sample.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sample.exe	sample.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

sample.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sample.exe = "C:\\Users\\Admin\\AppData\\Local\\Temp\\sample.exe"	sample.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 5 IoCs

Processes:

sample.exe

pid process

3916 sample.exe
3916 sample.exe
3916 sample.exe
3916 sample.exe
3916 sample.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

sample.exe

description pid process target process

PID 3916 set thread context of 5040 3916 sample.exe sample.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

sample.exe

pid process

3916 sample.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

sample.exe

description pid process

Token: SeDebugPrivilege 3916 sample.exe

pid	process
3916	sample.exe
3916	sample.exe
3916	sample.exe
3916	sample.exe
3916	sample.exe

description	pid	process	target process
PID 3916 set thread context of 5040	3916	sample.exe	sample.exe

pid	process
3916	sample.exe

description	pid	process
Token: SeDebugPrivilege	3916	sample.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

sample.exe

description	pid	process	target process
PID 3916 wrote to memory of 5040	3916	sample.exe	sample.exe
PID 3916 wrote to memory of 5040	3916	sample.exe	sample.exe
PID 3916 wrote to memory of 5040	3916	sample.exe	sample.exe
PID 3916 wrote to memory of 5040	3916	sample.exe	sample.exe
PID 3916 wrote to memory of 5040	3916	sample.exe	sample.exe
PID 3916 wrote to memory of 5040	3916	sample.exe	sample.exe
PID 3916 wrote to memory of 5040	3916	sample.exe	sample.exe
PID 3916 wrote to memory of 5040	3916	sample.exe	sample.exe

C:\Users\Admin\AppData\Local\Temp\sample.exe
"C:\Users\Admin\AppData\Local\Temp\sample.exe"
1⤵
- Modifies WinLogon for persistence
- Drops startup file
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3916
- C:\Users\Admin\AppData\Local\Temp\sample.exe
  "C:\Users\Admin\AppData\Local\Temp\sample.exe"
  2⤵
  PID:5040

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\sample.exe.log

Filesize
617B

MD5
99e770c0d4043aa84ef3d3cbc7723c25

SHA1
19829c5c413fccba750a3357f938dfa94486acad

SHA256
33c7dd4c852dae6462c701337f8e0a8647602847ccaee656fa6f1149cccfb5d5

SHA512
ba521e2f57d7e1db19445201948caa7af6d953e1c1340228934888f8ec05b8984ad492122d0bf0550b5e679614d8a713ecf68f91916ffa6e5d8f75bf003aae39

Download Submit
memory/3916-0-0x00000000746DE000-0x00000000746DF000-memory.dmp

Filesize
4KB

Download
memory/3916-1-0x0000000000600000-0x000000000066A000-memory.dmp

Filesize
424KB

Download
memory/3916-2-0x0000000004E90000-0x0000000004F2C000-memory.dmp

Filesize
624KB

Download
memory/3916-3-0x0000000004E00000-0x0000000004E46000-memory.dmp

Filesize
280KB

Download
memory/3916-4-0x00000000746D0000-0x0000000074E80000-memory.dmp

Filesize
7.7MB

Download
memory/3916-5-0x0000000005610000-0x0000000005BB4000-memory.dmp

Filesize
5.6MB

Download
memory/3916-10-0x00000000746D0000-0x0000000074E80000-memory.dmp

Filesize
7.7MB

Download
memory/5040-7-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download
memory/5040-11-0x00000000746D0000-0x0000000074E80000-memory.dmp

Filesize
7.7MB

Download
memory/5040-12-0x00000000746D0000-0x0000000074E80000-memory.dmp

Filesize
7.7MB

Download
memory/5040-13-0x00000000746D0000-0x0000000074E80000-memory.dmp

Filesize
7.7MB

Download