Overview
overview
10Static
static
snxdx/????.url
windows7_x64
6snxdx/????.url
windows10-2004_x64
6snxdx/?????.exe
windows7_x64
1snxdx/?????.exe
windows10-2004_x64
1snxdx/??????.url
windows7_x64
6snxdx/??????.url
windows10-2004_x64
6snxdx/Crac...PI.dll
windows7_x64
10snxdx/Crac...PI.dll
windows10-2004_x64
10snxdx/UUWi...er.dll
windows7_x64
1snxdx/UUWi...er.dll
windows10-2004_x64
3snxdx/dc.dll
windows7_x64
8snxdx/dc.dll
windows10-2004_x64
8snxdx/msvcr120.dll
windows7_x64
3snxdx/msvcr120.dll
windows10-2004_x64
3Analysis
-
max time kernel
143s -
max time network
154s -
platform
windows10-2004_x64 -
resource
win10v2004-20220414-en -
submitted
20-05-2022 04:06
Static task
static1
Behavioral task
behavioral1
Sample
snxdx/????.url
Resource
win7-20220414-en
Behavioral task
behavioral2
Sample
snxdx/????.url
Resource
win10v2004-20220414-en
Behavioral task
behavioral3
Sample
snxdx/?????.exe
Resource
win7-20220414-en
Behavioral task
behavioral4
Sample
snxdx/?????.exe
Resource
win10v2004-20220414-en
Behavioral task
behavioral5
Sample
snxdx/??????.url
Resource
win7-20220414-en
Behavioral task
behavioral6
Sample
snxdx/??????.url
Resource
win10v2004-20220414-en
Behavioral task
behavioral7
Sample
snxdx/CrackCaptchaAPI.dll
Resource
win7-20220414-en
Behavioral task
behavioral8
Sample
snxdx/CrackCaptchaAPI.dll
Resource
win10v2004-20220414-en
Behavioral task
behavioral9
Sample
snxdx/UUWiseHelper.dll
Resource
win7-20220414-en
Behavioral task
behavioral10
Sample
snxdx/UUWiseHelper.dll
Resource
win10v2004-20220414-en
Behavioral task
behavioral11
Sample
snxdx/dc.dll
Resource
win7-20220414-en
Behavioral task
behavioral12
Sample
snxdx/dc.dll
Resource
win10v2004-20220414-en
Behavioral task
behavioral13
Sample
snxdx/msvcr120.dll
Resource
win7-20220414-en
Behavioral task
behavioral14
Sample
snxdx/msvcr120.dll
Resource
win10v2004-20220414-en
General
-
Target
snxdx/CrackCaptchaAPI.dll
-
Size
1.4MB
-
MD5
803ff1fcf41f190b29838246f6f7615c
-
SHA1
3256620504b7694a98e65c8bb8bad6550035ba66
-
SHA256
79e965deb85ecd372dbbb5fd9c77867bcb4d5ad6e0c124ccc3ee51358305214d
-
SHA512
e18b8af2cc617558d248db9d33cd6f10ba27bff9a6dd3ae08acfff21e9f1e7e7966a078c56e939c13e79c7621e37ab1502a73b1292b040133008313d2e19b216
Malware Config
Signatures
-
Executes dropped EXE 1 IoCs
Processes:
rundll32Srv.exepid process 3976 rundll32Srv.exe -
Processes:
resource yara_rule C:\Windows\SysWOW64\rundll32Srv.exe 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.
Processes:
rundll32.exedescription ioc process File opened for modification \??\PhysicalDrive0 rundll32.exe -
Drops file in System32 directory 1 IoCs
Processes:
rundll32.exedescription ioc process File created C:\Windows\SysWOW64\rundll32Srv.exe rundll32.exe -
Program crash 2 IoCs
Processes:
WerFault.exeWerFault.exepid pid_target process target process 1108 3976 WerFault.exe rundll32Srv.exe 4564 2240 WerFault.exe rundll32.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
rundll32.exerundll32.exedescription pid process target process PID 4424 wrote to memory of 2240 4424 rundll32.exe rundll32.exe PID 4424 wrote to memory of 2240 4424 rundll32.exe rundll32.exe PID 4424 wrote to memory of 2240 4424 rundll32.exe rundll32.exe PID 2240 wrote to memory of 3976 2240 rundll32.exe rundll32Srv.exe PID 2240 wrote to memory of 3976 2240 rundll32.exe rundll32Srv.exe PID 2240 wrote to memory of 3976 2240 rundll32.exe rundll32Srv.exe
Processes
-
C:\Windows\system32\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\snxdx\CrackCaptchaAPI.dll,#11⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\snxdx\CrackCaptchaAPI.dll,#12⤵
- Writes to the Master Boot Record (MBR)
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\rundll32Srv.exeC:\Windows\SysWOW64\rundll32Srv.exe3⤵
- Executes dropped EXE
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3976 -s 2804⤵
- Program crash
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 2240 -s 6523⤵
- Program crash
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 2240 -ip 22401⤵
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3976 -ip 39761⤵
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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Downloads
-
C:\Windows\SysWOW64\rundll32Srv.exeFilesize
74KB
MD5fcaa38a6fdc673584dcbb74ef6fe70f2
SHA119aafcd6ea700210b973a3a6868d7e90f9cd1cf4
SHA256fbebaa19ad2bdb019d6ab6ddabafc075b902f17462acb15011264f897e932e35
SHA512f22c785749d705fac922bb9ac037e5955abebfbc4f3a936d4554e23e0b3ce0007597ac4d816eb81ecae5ca50c39a16e7b8d59ec1834dfdc40ebba781a9b5fae8
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memory/2240-130-0x0000000000000000-mapping.dmp
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memory/3976-131-0x0000000000000000-mapping.dmp