asyncrat | 7fdd7e02c94fd64e1a19e51f03dd0819b23437711690882d5ca765997f2447e7

Analysis

max time kernel
314s
max time network
595s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
23-05-2024 12:45

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General

Target

2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe
Size

6.1MB
MD5

4864a55cff27f686023456a22371e790
SHA1

6ed30c0371fe167d38411bfa6d720fcdcacc4f4c
SHA256

08c7fb6067acc8ac207d28ab616c9ea5bc0d394956455d6a3eecb73f8010f7a2
SHA512

4bd3a16435cca6ce7a7aa829eb967619a8b7c02598474e634442cffc55935870d54d844a04496bf9c7e8c29c40fae59ac6eb39c8550c091d06a28211491d0bfb
SSDEEP

98304:VZQIM+/nv/CDoAkYwpAa5ge1zZ/jtdZwUkQ:bJCKlA2VKUz

Score

10^/10

asyncrat cpa persistence rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

CPA

5.253.84.218:54657

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
false
install_folder
%AppData%

aes.plain

Signatures

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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

reg.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3968772205-1713802336-1776639840-1000\Software\Microsoft\Windows\CurrentVersion\Run\*ChromeUpdate = "rundll32.exe C:\\Users\\Admin\\Documents\\ChromeData.dll,EntryPoint"	reg.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe

description pid process target process

PID 644 set thread context of 1472 644 2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe csc.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

csc.exe

description pid process

Token: SeDebugPrivilege 1472 csc.exe

description	pid	process	target process
PID 644 set thread context of 1472	644	2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe	csc.exe

description	pid	process
Token: SeDebugPrivilege	1472	csc.exe

Suspicious use of WriteProcessMemory 11 IoCs

Processes:

2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.execmd.exe

description	pid	process	target process
PID 644 wrote to memory of 1472	644	2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe	csc.exe
PID 644 wrote to memory of 1472	644	2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe	csc.exe
PID 644 wrote to memory of 1472	644	2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe	csc.exe
PID 644 wrote to memory of 1472	644	2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe	csc.exe
PID 644 wrote to memory of 1472	644	2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe	csc.exe
PID 644 wrote to memory of 4788	644	2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe	cmd.exe
PID 644 wrote to memory of 4788	644	2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe	cmd.exe
PID 644 wrote to memory of 4788	644	2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe	cmd.exe
PID 4788 wrote to memory of 4100	4788	cmd.exe	reg.exe
PID 4788 wrote to memory of 4100	4788	cmd.exe	reg.exe
PID 4788 wrote to memory of 4100	4788	cmd.exe	reg.exe

C:\Users\Admin\AppData\Local\Temp\2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe
"C:\Users\Admin\AppData\Local\Temp\2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:644

C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"
2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1472

C:\Windows\SysWOW64\cmd.exe
cmd.exe /C reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*ChromeUpdate" /t REG_SZ /d "rundll32.exe C:\Users\Admin\Documents\ChromeData.dll",EntryPoint /f & exit
2⤵
- Suspicious use of WriteProcessMemory
PID:4788

C:\Windows\SysWOW64\reg.exe
reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*ChromeUpdate" /t REG_SZ /d "rundll32.exe C:\Users\Admin\Documents\ChromeData.dll",EntryPoint /f
3⤵
- Adds Run key to start application
PID:4100

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

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/644-1-0x00000000102E6000-0x0000000010300000-memory.dmp

Filesize
104KB

Download
memory/644-0-0x0000000010000000-0x0000000012D6B000-memory.dmp

Filesize
45.4MB

Download
memory/644-2-0x0000000010000000-0x0000000012D6B000-memory.dmp

Filesize
45.4MB

Download
memory/644-4-0x0000000010000000-0x0000000012D6B000-memory.dmp

Filesize
45.4MB

Download
memory/644-8-0x0000000010000000-0x0000000012D6B000-memory.dmp

Filesize
45.4MB

Download
memory/644-19-0x0000000012D0B000-0x0000000012D0F000-memory.dmp

Filesize
16KB

Download
memory/1472-3-0x0000000000800000-0x0000000000812000-memory.dmp

Filesize
72KB

Download
memory/1472-15-0x0000000009CF0000-0x0000000009D8C000-memory.dmp

Filesize
624KB

Download
memory/1472-16-0x000000000A290000-0x000000000A78E000-memory.dmp

Filesize
5.0MB

Download
memory/1472-17-0x0000000009E00000-0x0000000009E66000-memory.dmp

Filesize
408KB

Download
memory/1472-20-0x0000000072BFE000-0x0000000072BFF000-memory.dmp

Filesize
4KB

Download
memory/1472-21-0x0000000072BFE000-0x0000000072BFF000-memory.dmp

Filesize
4KB

Download