asyncrat | 55b779f35f7ba5b7e409de245f0c6c8c2f7f38292f7d33b42e65f1fe4cbe6ee9

Analysis

max time kernel
150s
max time network
157s
platform
windows7_x64
resource
win7
submitted
14/10/2020, 15:41

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General

Target
CT558801294_504670_03732174347.PDF.exe
Size 3.2MB
Sample201014-z4wtem7the
SHA256 55b779f35f7ba5b7e409de245f0c6c8c2f7f38292f7d33b42e65f1fe4cbe6ee9
MD5 e23cff81572101abd02dadc9f6269b6e
SHA1 4c06a1a5471ebdba8669981e9a50de00a09bf120
SHA512 4a5c62c3b72229e4cad99ccbbd9f5532d269392e87b76216d0a055855dbc888a70df168a895ebe7abf7905b9120f5a018e1d6c4e7ead7007cbdcde64f58e014c
MD5 SHA1 SHA512

Score

10^/10

rat spyware asyncrat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

185.244.30.121:7882

Mutex

AsyncMutex_6SI8OkPnk

Attributes

aes_key
7waMnQU7XKn0KiCxCoUXlyImOaz9FZeu
anti_detection
false
autorun
false
bdos
false
delay
Default
host
185.244.30.121
hwid
3
install_file
install_folder
%AppData%
mutex
AsyncMutex_6SI8OkPnk
pastebin_config
null
port
7882
version
0.5.7B

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat

Async RAT payload 4 IoCs

rat

resource	yara_rule
behavioral1/memory/1936-56-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1936-57-0x000000000040C70E-mapping.dmp	asyncrat
behavioral1/memory/1936-58-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1936-59-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat

Executes dropped EXE 4 IoCs

pid	Process
1944	tree3.exe
864	scan21.exe
1760	A.exe
836	B.exe

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\scan21.lnk	scan21.exe

Loads dropped DLL 7 IoCs

pid	Process
1660	cmd.exe
1376	cmd.exe
1496	cmd.exe
1496	cmd.exe
864	scan21.exe
336	cmd.exe
336	cmd.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware

Data from Local System
T1005

Credentials in Files
T1081

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\scan21.exe	cmd.exe
File created	C:\Windows\SysWOW64\scan21.exe	cmd.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1944 set thread context of 1264	1944	tree3.exe	33
PID 864 set thread context of 1936	864	scan21.exe	42

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1760	A.exe
1760	A.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1440	CT558801294_504670_03732174347.PDF.exe
Token: SeDebugPrivilege	1944	tree3.exe
Token: SeDebugPrivilege	864	scan21.exe

Suspicious use of WriteProcessMemory 59 IoCs

description	pid	Process	procid_target
PID 1440 wrote to memory of 1660	1440	CT558801294_504670_03732174347.PDF.exe	28
PID 1440 wrote to memory of 1660	1440	CT558801294_504670_03732174347.PDF.exe	28
PID 1440 wrote to memory of 1660	1440	CT558801294_504670_03732174347.PDF.exe	28
PID 1440 wrote to memory of 1660	1440	CT558801294_504670_03732174347.PDF.exe	28
PID 1660 wrote to memory of 1944	1660	cmd.exe	30
PID 1660 wrote to memory of 1944	1660	cmd.exe	30
PID 1660 wrote to memory of 1944	1660	cmd.exe	30
PID 1660 wrote to memory of 1944	1660	cmd.exe	30
PID 1440 wrote to memory of 2020	1440	CT558801294_504670_03732174347.PDF.exe	31
PID 1440 wrote to memory of 2020	1440	CT558801294_504670_03732174347.PDF.exe	31
PID 1440 wrote to memory of 2020	1440	CT558801294_504670_03732174347.PDF.exe	31
PID 1440 wrote to memory of 2020	1440	CT558801294_504670_03732174347.PDF.exe	31
PID 1944 wrote to memory of 1264	1944	tree3.exe	33
PID 1944 wrote to memory of 1264	1944	tree3.exe	33
PID 1944 wrote to memory of 1264	1944	tree3.exe	33
PID 1944 wrote to memory of 1264	1944	tree3.exe	33
PID 1944 wrote to memory of 1264	1944	tree3.exe	33
PID 1944 wrote to memory of 1264	1944	tree3.exe	33
PID 1944 wrote to memory of 1264	1944	tree3.exe	33
PID 1944 wrote to memory of 1264	1944	tree3.exe	33
PID 1944 wrote to memory of 1264	1944	tree3.exe	33
PID 1944 wrote to memory of 1264	1944	tree3.exe	33
PID 1944 wrote to memory of 1264	1944	tree3.exe	33
PID 1440 wrote to memory of 1376	1440	CT558801294_504670_03732174347.PDF.exe	35
PID 1440 wrote to memory of 1376	1440	CT558801294_504670_03732174347.PDF.exe	35
PID 1440 wrote to memory of 1376	1440	CT558801294_504670_03732174347.PDF.exe	35
PID 1440 wrote to memory of 1376	1440	CT558801294_504670_03732174347.PDF.exe	35
PID 1376 wrote to memory of 864	1376	cmd.exe	37
PID 1376 wrote to memory of 864	1376	cmd.exe	37
PID 1376 wrote to memory of 864	1376	cmd.exe	37
PID 1376 wrote to memory of 864	1376	cmd.exe	37
PID 1264 wrote to memory of 1496	1264	mscorsvw.exe	39
PID 1264 wrote to memory of 1496	1264	mscorsvw.exe	39
PID 1264 wrote to memory of 1496	1264	mscorsvw.exe	39
PID 1264 wrote to memory of 1496	1264	mscorsvw.exe	39
PID 1496 wrote to memory of 1760	1496	cmd.exe	41
PID 1496 wrote to memory of 1760	1496	cmd.exe	41
PID 1496 wrote to memory of 1760	1496	cmd.exe	41
PID 1496 wrote to memory of 1760	1496	cmd.exe	41
PID 864 wrote to memory of 1936	864	scan21.exe	42
PID 864 wrote to memory of 1936	864	scan21.exe	42
PID 864 wrote to memory of 1936	864	scan21.exe	42
PID 864 wrote to memory of 1936	864	scan21.exe	42
PID 864 wrote to memory of 1936	864	scan21.exe	42
PID 864 wrote to memory of 1936	864	scan21.exe	42
PID 864 wrote to memory of 1936	864	scan21.exe	42
PID 864 wrote to memory of 1936	864	scan21.exe	42
PID 864 wrote to memory of 1936	864	scan21.exe	42
PID 864 wrote to memory of 1936	864	scan21.exe	42
PID 864 wrote to memory of 1936	864	scan21.exe	42
PID 864 wrote to memory of 1936	864	scan21.exe	42
PID 1264 wrote to memory of 336	1264	mscorsvw.exe	43
PID 1264 wrote to memory of 336	1264	mscorsvw.exe	43
PID 1264 wrote to memory of 336	1264	mscorsvw.exe	43
PID 1264 wrote to memory of 336	1264	mscorsvw.exe	43
PID 336 wrote to memory of 836	336	cmd.exe	45
PID 336 wrote to memory of 836	336	cmd.exe	45
PID 336 wrote to memory of 836	336	cmd.exe	45
PID 336 wrote to memory of 836	336	cmd.exe	45

C:\Users\Admin\AppData\Local\Temp\CT558801294_504670_03732174347.PDF.exe
"C:\Users\Admin\AppData\Local\Temp\CT558801294_504670_03732174347.PDF.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1440
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c, "C:\Users\Admin\Pictures\tree3.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1660
- - C:\Users\Admin\Pictures\tree3.exe
    "C:\Users\Admin\Pictures\tree3.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1944
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorsvw.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorsvw.exe"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1264
    - - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c A.exe /stext A.txt
        5⤵
        Loads dropped DLL
        Suspicious use of WriteProcessMemory
        
        PID:1496
      - C:\Users\Admin\AppData\Local\Temp\A.exe
        
        A.exe /stext A.txt
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        
        PID:1760
    - - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c B.exe /stext B.txt
        5⤵
        Loads dropped DLL
        Suspicious use of WriteProcessMemory
        
        PID:336
      - C:\Users\Admin\AppData\Local\Temp\B.exe
        
        B.exe /stext B.txt
        6⤵
        Executes dropped EXE
        
        PID:836
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c copy "C:\Users\Admin\AppData\Local\Temp\CT558801294_504670_03732174347.PDF.exe" "C:\Windows\system32\scan21.exe"
  2⤵
  - Drops file in System32 directory
  PID:2020
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c, "C:\Windows\system32\scan21.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1376
- - C:\Windows\SysWOW64\scan21.exe
    "C:\Windows\system32\scan21.exe"
    3⤵
    - Executes dropped EXE
    - Drops startup file
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:864
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe"
      4⤵
      PID:1936

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/864-29-0x0000000072D50000-0x000000007343E000-memory.dmp

Download

memory/864-30-0x0000000000160000-0x0000000000161000-memory.dmp

Download

memory/1020-20-0x000007FEF6360000-0x000007FEF65DA000-memory.dmp

Download

memory/1264-19-0x0000000000400000-0x00000000004E1000-memory.dmp

Download

memory/1264-17-0x0000000000400000-0x00000000004E1000-memory.dmp

Download

memory/1440-0-0x00000000738C0000-0x0000000073FAE000-memory.dmp

Download

memory/1440-1-0x0000000001230000-0x0000000001231000-memory.dmp

Download

memory/1440-3-0x0000000000480000-0x0000000000497000-memory.dmp

Download

memory/1440-4-0x0000000000600000-0x000000000061F000-memory.dmp

Download

memory/1936-56-0x0000000000400000-0x0000000000412000-memory.dmp

Download

memory/1936-59-0x0000000000400000-0x0000000000412000-memory.dmp

Download

memory/1936-61-0x0000000072D50000-0x000000007343E000-memory.dmp

Download

memory/1936-58-0x0000000000400000-0x0000000000412000-memory.dmp

Download

memory/1944-11-0x0000000000850000-0x0000000000851000-memory.dmp

Download

memory/1944-10-0x00000000738C0000-0x0000000073FAE000-memory.dmp

Download

memory/1944-16-0x00000000005A0000-0x00000000005AA000-memory.dmp

Download