asyncrat | 7ce2d225442252064d744be1c38e9c1572dd355bbbaf7fa411ce79e41288dfca

Analysis

max time kernel
132s
max time network
142s
platform
windows7_x64
resource
win7-20240705-en
resource tags

arch:x64arch:x86image:win7-20240705-enlocale:en-usos:windows7-x64system
submitted
04-08-2024 12:56

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General

Target

919b43661894503a00d44ffd1174d613.exe
Size

64KB
MD5

919b43661894503a00d44ffd1174d613
SHA1

c510009fb7bad735e35a10c0ebe925d730ca961f
SHA256

7ce2d225442252064d744be1c38e9c1572dd355bbbaf7fa411ce79e41288dfca
SHA512

5019e86e2c0585aa59d7c14b4a0b03c911440487b9bd843db0a6138861e46274f17d72deea09429b650c5976aa9bf03d7427d65b26cc4b65c0c0bd9f1b19997b
SSDEEP

768:N9aGzWs/9PiPJ5eit9JSTLavfU4OnsD3q66T1+4SCv7mqb2nRpwH1oDjoUhPGnPP:vaW90TekUJyq6OqGbbUwDuGnPpqKmY7

Score

10^/10

asyncrat discovery execution rat

Malware Config

Extracted

Family

asyncrat

Version

5.0.5

server.underground-cheat.xyz:4449

Mutex

Venom_RAT_HVNC_Mutex_Venom RAT_HVNC

Attributes

delay
1
install
true
install_file
Host Process for Windows.exe
install_folder
%AppData%

aes.plain

Extracted

Family

asyncrat

Version

0.5.8

blue.o7lab.me:7777

server.underground-cheat.xyz:7777

Mutex

RPYntXGt1eJi

Attributes

delay
3
install
true
install_file
WinUpdate.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 2 IoCs

rat

resource	yara_rule
behavioral1/files/0x00090000000120fa-15.dat	family_asyncrat
behavioral1/files/0x000c0000000193df-60.dat	family_asyncrat

Executes dropped EXE 3 IoCs

pid	Process
2672	Host Process for Windows.exe
2864	$77svchost.exe
1364	WinUpdate.exe

Loads dropped DLL 1 IoCs

pid	Process
2704	cmd.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Start PowerShell.

execution

PowerShell

T1059.001

pid	Process
1036	powershell.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	$77svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WinUpdate.exe

Delays execution with timeout.exe 2 IoCs

evasion

pid	Process
2960	timeout.exe
828	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
1180	schtasks.exe
1292	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
600	919b43661894503a00d44ffd1174d613.exe
600	919b43661894503a00d44ffd1174d613.exe
600	919b43661894503a00d44ffd1174d613.exe
1036	powershell.exe
1036	powershell.exe
1036	powershell.exe
2672	Host Process for Windows.exe
2864	$77svchost.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	600	919b43661894503a00d44ffd1174d613.exe
Token: SeDebugPrivilege	2672	Host Process for Windows.exe
Token: SeDebugPrivilege	1036	powershell.exe
Token: SeDebugPrivilege	2864	$77svchost.exe
Token: SeDebugPrivilege	1364	WinUpdate.exe

Suspicious use of WriteProcessMemory 48 IoCs

description	pid	Process	procid_target
PID 600 wrote to memory of 2844	600	919b43661894503a00d44ffd1174d613.exe	30
PID 600 wrote to memory of 2844	600	919b43661894503a00d44ffd1174d613.exe	30
PID 600 wrote to memory of 2844	600	919b43661894503a00d44ffd1174d613.exe	30
PID 600 wrote to memory of 2456	600	919b43661894503a00d44ffd1174d613.exe	31
PID 600 wrote to memory of 2456	600	919b43661894503a00d44ffd1174d613.exe	31
PID 600 wrote to memory of 2456	600	919b43661894503a00d44ffd1174d613.exe	31
PID 2456 wrote to memory of 2960	2456	cmd.exe	34
PID 2456 wrote to memory of 2960	2456	cmd.exe	34
PID 2456 wrote to memory of 2960	2456	cmd.exe	34
PID 2844 wrote to memory of 1180	2844	cmd.exe	35
PID 2844 wrote to memory of 1180	2844	cmd.exe	35
PID 2844 wrote to memory of 1180	2844	cmd.exe	35
PID 2456 wrote to memory of 2672	2456	cmd.exe	36
PID 2456 wrote to memory of 2672	2456	cmd.exe	36
PID 2456 wrote to memory of 2672	2456	cmd.exe	36
PID 2672 wrote to memory of 1752	2672	Host Process for Windows.exe	38
PID 2672 wrote to memory of 1752	2672	Host Process for Windows.exe	38
PID 2672 wrote to memory of 1752	2672	Host Process for Windows.exe	38
PID 1752 wrote to memory of 1036	1752	cmd.exe	40
PID 1752 wrote to memory of 1036	1752	cmd.exe	40
PID 1752 wrote to memory of 1036	1752	cmd.exe	40
PID 1036 wrote to memory of 2864	1036	powershell.exe	41
PID 1036 wrote to memory of 2864	1036	powershell.exe	41
PID 1036 wrote to memory of 2864	1036	powershell.exe	41
PID 1036 wrote to memory of 2864	1036	powershell.exe	41
PID 2864 wrote to memory of 692	2864	$77svchost.exe	42
PID 2864 wrote to memory of 692	2864	$77svchost.exe	42
PID 2864 wrote to memory of 692	2864	$77svchost.exe	42
PID 2864 wrote to memory of 692	2864	$77svchost.exe	42
PID 2864 wrote to memory of 2704	2864	$77svchost.exe	44
PID 2864 wrote to memory of 2704	2864	$77svchost.exe	44
PID 2864 wrote to memory of 2704	2864	$77svchost.exe	44
PID 2864 wrote to memory of 2704	2864	$77svchost.exe	44
PID 692 wrote to memory of 1292	692	cmd.exe	46
PID 692 wrote to memory of 1292	692	cmd.exe	46
PID 692 wrote to memory of 1292	692	cmd.exe	46
PID 692 wrote to memory of 1292	692	cmd.exe	46
PID 2704 wrote to memory of 828	2704	cmd.exe	47
PID 2704 wrote to memory of 828	2704	cmd.exe	47
PID 2704 wrote to memory of 828	2704	cmd.exe	47
PID 2704 wrote to memory of 828	2704	cmd.exe	47
PID 2704 wrote to memory of 1364	2704	cmd.exe	48
PID 2704 wrote to memory of 1364	2704	cmd.exe	48
PID 2704 wrote to memory of 1364	2704	cmd.exe	48
PID 2704 wrote to memory of 1364	2704	cmd.exe	48
PID 2704 wrote to memory of 1364	2704	cmd.exe	48
PID 2704 wrote to memory of 1364	2704	cmd.exe	48
PID 2704 wrote to memory of 1364	2704	cmd.exe	48

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\919b43661894503a00d44ffd1174d613.exe
"C:\Users\Admin\AppData\Local\Temp\919b43661894503a00d44ffd1174d613.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:600
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Host Process for Windows" /tr '"C:\Users\Admin\AppData\Roaming\Host Process for Windows.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2844
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Host Process for Windows" /tr '"C:\Users\Admin\AppData\Roaming\Host Process for Windows.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1180
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpC9F3.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2456
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2960
- - C:\Users\Admin\AppData\Roaming\Host Process for Windows.exe
    "C:\Users\Admin\AppData\Roaming\Host Process for Windows.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2672
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c start /b powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\$77svchost.exe"' & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1752
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\$77svchost.exe"'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:1036
      - C:\Users\Admin\AppData\Local\Temp\$77svchost.exe
        
        "C:\Users\Admin\AppData\Local\Temp\$77svchost.exe"
        6⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:2864
        
        C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "WinUpdate" /tr '"C:\Users\Admin\AppData\Roaming\WinUpdate.exe"' & exit
        7⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:692
        
        C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /f /sc onlogon /rl highest /tn "WinUpdate" /tr '"C:\Users\Admin\AppData\Roaming\WinUpdate.exe"'
        8⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:1292
        
        C:\Windows\SysWOW64\cmd.exe
        
        cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp4C2.tmp.bat""
        7⤵
        Loads dropped DLL
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:2704
        
        C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        8⤵
        System Location Discovery: System Language Discovery
        Delays execution with timeout.exe
        
        PID:828
        
        C:\Users\Admin\AppData\Roaming\WinUpdate.exe
        
        "C:\Users\Admin\AppData\Roaming\WinUpdate.exe"
        8⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        
        PID:1364

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\$77svchost.exe

Filesize
45KB

MD5
a44a767dba207c04c74afae17144f787

SHA1
fa14f38216e259be5b181c825719f1c864691a5f

SHA256
26eaa5bce06cadc54cb4990fabb1b9150966ef720b07a836ef2bd456360246b2

SHA512
7dfd6e182ac9f16b29843cb0eabaa7db02fa3ee59c65c7822d9213859c4a7185d0fdcd1d51747a11b4fdd3a7947ea14fdc7fa583c13b4d3edf50b8d6d3178619

Download Submit
C:\Users\Admin\AppData\Local\Temp\CabDF78.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\TarF32A.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp4C2.tmp.bat

Filesize
152B

MD5
1cb5a751dcc08d5f783de034e0c1d97a

SHA1
83c042355d4afdd0fc2ea2e731912e8b6d45d1fc

SHA256
37c47890be457bbb08797a05165c7021ea02f10878b6deb3aabfc4a4be1ca260

SHA512
70b2e4ecb755e8ea80d5e52c9c7169e3a51e50acb26fb47e5575522c7a5c0f7ea09d18372eaaaaeec8e8f9f173d0494640f38d54813f2cae85ba8389f4dde5e1

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC9F3.tmp.bat

Filesize
168B

MD5
eb9f80d87aa2f7ed3dc5a904aaa063d8

SHA1
11c12f230febdf88762177efd8a3bb2b3efc35e1

SHA256
85dc9b9b86071b139ae437a889e33e85511bf2227f0ee29c0d81b0af6728529a

SHA512
2cd1af476a1393d60449ebc24a5ed16d19c72f5a7003f5966f709898a2b4519479150d7062b0d3cafbcf586d2587041ef12905c5d866831b3b275ab1fcf01dcd

Download Submit
C:\Users\Admin\AppData\Roaming\Host Process for Windows.exe

Filesize
64KB

MD5
919b43661894503a00d44ffd1174d613

SHA1
c510009fb7bad735e35a10c0ebe925d730ca961f

SHA256
7ce2d225442252064d744be1c38e9c1572dd355bbbaf7fa411ce79e41288dfca

SHA512
5019e86e2c0585aa59d7c14b4a0b03c911440487b9bd843db0a6138861e46274f17d72deea09429b650c5976aa9bf03d7427d65b26cc4b65c0c0bd9f1b19997b

Download Submit
memory/600-11-0x000007FEF4BF0000-0x000007FEF55DC000-memory.dmp

Filesize
9.9MB

Download
memory/600-12-0x000007FEF4BF0000-0x000007FEF55DC000-memory.dmp

Filesize
9.9MB

Download
memory/600-0-0x000007FEF4BF3000-0x000007FEF4BF4000-memory.dmp

Filesize
4KB

Download
memory/600-2-0x000007FEF4BF0000-0x000007FEF55DC000-memory.dmp

Filesize
9.9MB

Download
memory/600-1-0x0000000000D90000-0x0000000000DA6000-memory.dmp

Filesize
88KB

Download
memory/1036-58-0x000000001B620000-0x000000001B902000-memory.dmp

Filesize
2.9MB

Download
memory/1036-59-0x0000000002240000-0x0000000002248000-memory.dmp

Filesize
32KB

Download
memory/1364-76-0x0000000001310000-0x0000000001322000-memory.dmp

Filesize
72KB

Download
memory/2672-17-0x0000000000A20000-0x0000000000A36000-memory.dmp

Filesize
88KB

Download
memory/2672-34-0x0000000000980000-0x000000000098E000-memory.dmp

Filesize
56KB

Download
memory/2864-62-0x00000000011F0000-0x0000000001202000-memory.dmp

Filesize
72KB

Download