asyncrat | b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
11-01-2025 09:57

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General

Target

b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe
Size

1.3MB
MD5

3a9f8ec832df29647e58993ca0e7c160
SHA1

2ad6a8340261823adb53b066007d4a39eba35ed1
SHA256

b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035
SHA512

c4062c4ee074f53eef3123a5e3d922f87cb87657bef62338339eaec6d6ae57e0322627db0f83751b0b3678a4d230f23a3ee2776897231b9fa9f912c8078de123
SSDEEP

24576:VMjhqBd3X3R+wTqM6FWEn72mHvKgcLJj3gSPWbLK3AtIT2Awyfc7MEYbO:MEBdH3dt6gmHdclj3IK3zT27yEbYa

Score

10^/10

asyncrat venomrat default discovery execution rat

Malware Config

Extracted

Family

asyncrat

Version

v1.2.2

Botnet

Default

192.238.134.73:56003

192.238.134.73:56004

192.238.134.73:56005

Mutex

vjggiafzsllukefmlx

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
Asyncrat family
asyncrat

VenomRAT 1 IoCs

Detects VenomRAT.

rat

resource	yara_rule
behavioral1/memory/2840-67-0x0000000000220000-0x0000000000232000-memory.dmp	VenomRAT

Venomrat family
venomrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/memory/2840-67-0x0000000000220000-0x0000000000232000-memory.dmp	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
2708	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp
2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp

Loads dropped DLL 8 IoCs

pid	Process
2800	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe
2708	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp
2708	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp
2592	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe
2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp
2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp
2632	regsvr32.exe
2840	regsvr32.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to execute payload.

execution

PowerShell

T1059.001

pid	Process
1800	powershell.exe
2900	powershell.exe
1800	powershell.exe
2900	powershell.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\%ProgramData%\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\Windows PowerShell.lnk	powershell.exe
File opened for modification	C:\Windows\System32\%ProgramData%\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\Windows PowerShell.lnk	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 5 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	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp
2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp
1800	powershell.exe
2900	powershell.exe
2840	regsvr32.exe
2840	regsvr32.exe
2840	regsvr32.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1800	powershell.exe
Token: SeDebugPrivilege	2900	powershell.exe
Token: SeDebugPrivilege	2840	regsvr32.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2840	regsvr32.exe

Suspicious use of WriteProcessMemory 41 IoCs

description	pid	Process	procid_target
PID 2800 wrote to memory of 2708	2800	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	31
PID 2800 wrote to memory of 2708	2800	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	31
PID 2800 wrote to memory of 2708	2800	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	31
PID 2800 wrote to memory of 2708	2800	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	31
PID 2800 wrote to memory of 2708	2800	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	31
PID 2800 wrote to memory of 2708	2800	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	31
PID 2800 wrote to memory of 2708	2800	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	31
PID 2708 wrote to memory of 2592	2708	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	32
PID 2708 wrote to memory of 2592	2708	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	32
PID 2708 wrote to memory of 2592	2708	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	32
PID 2708 wrote to memory of 2592	2708	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	32
PID 2708 wrote to memory of 2592	2708	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	32
PID 2708 wrote to memory of 2592	2708	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	32
PID 2708 wrote to memory of 2592	2708	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	32
PID 2592 wrote to memory of 2692	2592	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	33
PID 2592 wrote to memory of 2692	2592	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	33
PID 2592 wrote to memory of 2692	2592	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	33
PID 2592 wrote to memory of 2692	2592	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	33
PID 2592 wrote to memory of 2692	2592	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	33
PID 2592 wrote to memory of 2692	2592	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	33
PID 2592 wrote to memory of 2692	2592	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe	33
PID 2692 wrote to memory of 2632	2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	34
PID 2692 wrote to memory of 2632	2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	34
PID 2692 wrote to memory of 2632	2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	34
PID 2692 wrote to memory of 2632	2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	34
PID 2692 wrote to memory of 2632	2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	34
PID 2692 wrote to memory of 2632	2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	34
PID 2692 wrote to memory of 2632	2692	b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp	34
PID 2632 wrote to memory of 2840	2632	regsvr32.exe	35
PID 2632 wrote to memory of 2840	2632	regsvr32.exe	35
PID 2632 wrote to memory of 2840	2632	regsvr32.exe	35
PID 2632 wrote to memory of 2840	2632	regsvr32.exe	35
PID 2632 wrote to memory of 2840	2632	regsvr32.exe	35
PID 2632 wrote to memory of 2840	2632	regsvr32.exe	35
PID 2632 wrote to memory of 2840	2632	regsvr32.exe	35
PID 2840 wrote to memory of 1800	2840	regsvr32.exe	36
PID 2840 wrote to memory of 1800	2840	regsvr32.exe	36
PID 2840 wrote to memory of 1800	2840	regsvr32.exe	36
PID 2840 wrote to memory of 2900	2840	regsvr32.exe	38
PID 2840 wrote to memory of 2900	2840	regsvr32.exe	38
PID 2840 wrote to memory of 2900	2840	regsvr32.exe	38

C:\Users\Admin\AppData\Local\Temp\b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe
"C:\Users\Admin\AppData\Local\Temp\b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2800
- C:\Users\Admin\AppData\Local\Temp\is-179GD.tmp\b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-179GD.tmp\b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp" /SL5="$5013A,948933,235520,C:\Users\Admin\AppData\Local\Temp\b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2708
- - C:\Users\Admin\AppData\Local\Temp\b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe
    "C:\Users\Admin\AppData\Local\Temp\b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe" /VERYSILENT
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2592
  - - C:\Users\Admin\AppData\Local\Temp\is-NRVI6.tmp\b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-NRVI6.tmp\b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp" /SL5="$30136,948933,235520,C:\Users\Admin\AppData\Local\Temp\b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.exe" /VERYSILENT
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of FindShellTrayWindow
      Suspicious use of WriteProcessMemory
      PID:2692
    - - C:\Windows\SysWOW64\regsvr32.exe
        
        "regsvr32.exe" /s /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
        5⤵
        Loads dropped DLL
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:2632
      - C:\Windows\system32\regsvr32.exe
        
        /s /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll
        6⤵
        Loads dropped DLL
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:2840
        
        C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command "if (Get-ScheduledTask | Where-Object { $_.Actions.Execute -eq 'regsvr32' -and $_.Actions.Arguments -eq '/S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll' }) { exit 0 } else { exit 1 }"
        7⤵
        Command and Scripting Interpreter: PowerShell
        Drops file in System32 directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1800
        
        C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" "Register-ScheduledTask -Action (New-ScheduledTaskAction -Execute \"regsvr32\" -Argument \"/S /i:360 C:\Users\Admin\AppData\Roaming\Setup_Stork.dll\") -Trigger (New-ScheduledTaskTrigger -Once -At (Get-Date).AddMinutes(1) -RepetitionInterval (New-TimeSpan -Minutes 1)) -TaskName 'MicrosoftEdgeUpdateTaskMachineUA{4446BB4F-424E-42C7-C790-59676ED34A79}' -Description 'MicrosoftEdgeUpdateTaskMachineUA' -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries -ExecutionTimeLimit 0) -RunLevel Highest"
        7⤵
        Command and Scripting Interpreter: PowerShell
        Drops file in System32 directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2900

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Cab2232.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\FAKF90U5YJ3KB9T2ZJLZ.temp

Filesize
7KB

MD5
dfe5a12418aa5ee60810b8fed4212147

SHA1
1abbfe950bf20f6375828f291a4c360739b42841

SHA256
9a1d17d44ffb98cc5dcf8ea498cb900f201dc1a17f7801b0d220ab87d5b6caac

SHA512
2de3bc57560d83840d2e13b21da8edbc2dffc5fb8a34550ccbd6bfa5d8f75629a948d5596e45943a56bc0c01cf83ca9f4db684e407b2f3793cf0a488358ed1a0

Download Submit
C:\Users\Admin\AppData\Roaming\Setup_Stork.dll

Filesize
2.6MB

MD5
be749ce6cea9df27363dd3a47682344b

SHA1
db9680d1fbaa852212a4693d37d64f412c30a1bc

SHA256
8ae29824b1554e170133fe7fae8b9208526f1ab1b70a6299f5befcc0482db095

SHA512
8f423ea8db31aaa723145ba94e00c2c2891ad361ee6e0dc5f8f2fd11f2e7cd72c387157e6d7c759eb9f8b9f227e317775ef71c283687fa8a58779ef70abbbf42

Download Submit
\Users\Admin\AppData\Local\Temp\is-02E0O.tmp\_isetup\_shfoldr.dll

Filesize
22KB

MD5
92dc6ef532fbb4a5c3201469a5b5eb63

SHA1
3e89ff837147c16b4e41c30d6c796374e0b8e62c

SHA256
9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87

SHA512
9908e573921d5dbc3454a1c0a6c969ab8a81cc2e8b5385391d46b1a738fb06a76aa3282e0e58d0d2ffa6f27c85668cd5178e1500b8a39b1bbae04366ae6a86d3

Download Submit
\Users\Admin\AppData\Local\Temp\is-179GD.tmp\b3ce538a77c86b1f9840d53e42999b9535ad74d83e4b00e527193c963ddd0035N.tmp

Filesize
1.2MB

MD5
bef5bad133138ce27f0c6e73d5a2e5f9

SHA1
1cfc9e170e100fc23073cdfcf590594e18598314

SHA256
55adc6677700e166913c9f26a213d93244242b17331b4f9a606760117b698b65

SHA512
f8d3d971a58fdc2d7585c61c70c41d0625b2cbda9698f7a26ed009374d9f4986effc9d69dd1579f38f22bd7e7700d714702df663dfcc195c11b6fc2d0b315f2d

Download Submit
memory/1800-54-0x00000000027E0000-0x00000000027E8000-memory.dmp

Filesize
32KB

Download
memory/1800-53-0x000000001B730000-0x000000001BA12000-memory.dmp

Filesize
2.9MB

Download
memory/2592-45-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/2592-18-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/2592-21-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/2692-43-0x0000000000400000-0x000000000053F000-memory.dmp

Filesize
1.2MB

Download
memory/2708-20-0x0000000000400000-0x000000000053F000-memory.dmp

Filesize
1.2MB

Download
memory/2708-8-0x0000000000400000-0x000000000053F000-memory.dmp

Filesize
1.2MB

Download
memory/2800-24-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/2800-0-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/2800-2-0x0000000000401000-0x0000000000417000-memory.dmp

Filesize
88KB

Download
memory/2840-66-0x000007FEF58C0000-0x000007FEF5B4A000-memory.dmp

Filesize
2.5MB

Download
memory/2840-67-0x0000000000220000-0x0000000000232000-memory.dmp

Filesize
72KB

Download
memory/2900-62-0x0000000001EF0000-0x0000000001EF8000-memory.dmp

Filesize
32KB

Download
memory/2900-61-0x000000001B760000-0x000000001BA42000-memory.dmp

Filesize
2.9MB

Download