fdf992cbc82531ce80c29e74897ed6e26dcac9ec1217264dbaee0ddbd69acf06

Analysis

max time kernel
92s
max time network
129s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
28/02/2024, 01:58

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General

Target

snxdx/snxdx/CrackCaptchaAPI.dll
Size

1.4MB
MD5

803ff1fcf41f190b29838246f6f7615c
SHA1

3256620504b7694a98e65c8bb8bad6550035ba66
SHA256

79e965deb85ecd372dbbb5fd9c77867bcb4d5ad6e0c124ccc3ee51358305214d
SHA512

e18b8af2cc617558d248db9d33cd6f10ba27bff9a6dd3ae08acfff21e9f1e7e7966a078c56e939c13e79c7621e37ab1502a73b1292b040133008313d2e19b216
SSDEEP

24576:Rn6WrvFhoN0oXr2HbAR4rMuwKc3QC5fexfduH2FRNEpzvKdYr2TB3AEZ8:RPNet4PWQC5yluHQuzQYSTF3Z

Score

7^/10

bootkit persistence upx

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
2560	rundll32Srv.exe

UPX packed file 3 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/files/0x0007000000023227-3.dat	upx
behavioral2/memory/2560-4-0x0000000000400000-0x0000000000433000-memory.dmp	upx
behavioral2/memory/2560-5-0x0000000000400000-0x0000000000433000-memory.dmp	upx

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	rundll32.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\rundll32Srv.exe	rundll32.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
2296	4552	WerFault.exe	87
396	2560	WerFault.exe	89

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3352 wrote to memory of 4552	3352	rundll32.exe	87
PID 3352 wrote to memory of 4552	3352	rundll32.exe	87
PID 3352 wrote to memory of 4552	3352	rundll32.exe	87
PID 4552 wrote to memory of 2560	4552	rundll32.exe	89
PID 4552 wrote to memory of 2560	4552	rundll32.exe	89
PID 4552 wrote to memory of 2560	4552	rundll32.exe	89

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\snxdx\snxdx\CrackCaptchaAPI.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3352
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\snxdx\snxdx\CrackCaptchaAPI.dll,#1
  2⤵
  - Writes to the Master Boot Record (MBR)
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:4552
- - C:\Windows\SysWOW64\rundll32Srv.exe
    C:\Windows\SysWOW64\rundll32Srv.exe
    3⤵
    - Executes dropped EXE
    PID:2560
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2560 -s 280
      4⤵
      Program crash
      PID:396
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4552 -s 652
    3⤵
    - Program crash
    PID:2296

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4552 -ip 4552
1⤵
PID:3480

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 2560 -ip 2560
1⤵
PID:3000

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\SysWOW64\rundll32Srv.exe

Filesize
74KB

MD5
fcaa38a6fdc673584dcbb74ef6fe70f2

SHA1
19aafcd6ea700210b973a3a6868d7e90f9cd1cf4

SHA256
fbebaa19ad2bdb019d6ab6ddabafc075b902f17462acb15011264f897e932e35

SHA512
f22c785749d705fac922bb9ac037e5955abebfbc4f3a936d4554e23e0b3ce0007597ac4d816eb81ecae5ca50c39a16e7b8d59ec1834dfdc40ebba781a9b5fae8

Download Submit
memory/2560-4-0x0000000000400000-0x0000000000433000-memory.dmp

Filesize
204KB

Download
memory/2560-5-0x0000000000400000-0x0000000000433000-memory.dmp

Filesize
204KB

Download
memory/4552-1-0x00000000750E0000-0x000000007525C000-memory.dmp

Filesize
1.5MB

Download
memory/4552-6-0x00000000750E0000-0x000000007525C000-memory.dmp

Filesize
1.5MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads