33c6e4fe5c63964fe51650d02f755d231013b3fd6779275d36d79916a9f48104

General

Target

ok.exe
Size

4.1MB
MD5

a2cd4e544a0bb0d88b5d79da31187d07
SHA1

d6d29a4186f26a8aa28756b281ad8b3f3db440b9
SHA256

33c6e4fe5c63964fe51650d02f755d231013b3fd6779275d36d79916a9f48104
SHA512

13552d3ab29bb03a65e6c9e4863c760231a9d7ef0d9874472431c5ad82a4cc30c47a0b933a3257723bffb19e86c0981f98fb6519eb2de26853e66d42ecd7d001
SSDEEP

98304:jT+bJzjcXE8uwaIjMRSgoqYHz3uM+OS5yUss:wJzp8uXievoqYz1+jys

Score

9^/10

evasion persistence 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	ok.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\frAQBc8Wsa1xVPfv\ImagePath = "\\??\\C:\\Users\\Admin\\AppData\\Local\\Temp\\frAQBc8Wsa1xVPfv"	ok.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

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	ok.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	ok.exe

Themida packer 10 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/memory/624-0-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp	themida
behavioral2/memory/624-2-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp	themida
behavioral2/memory/624-3-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp	themida
behavioral2/memory/624-4-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp	themida
behavioral2/memory/624-6-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp	themida
behavioral2/memory/624-5-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp	themida
behavioral2/memory/624-7-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp	themida
behavioral2/memory/624-8-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp	themida
behavioral2/memory/624-15-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp	themida
behavioral2/memory/624-16-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

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

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
624	ok.exe

Suspicious behavior: LoadsDriver 1 IoCs

pid	Process
624	ok.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeLoadDriverPrivilege	624	ok.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 624 wrote to memory of 2412	624	ok.exe	92
PID 624 wrote to memory of 2412	624	ok.exe	92
PID 2412 wrote to memory of 2024	2412	cmd.exe	94
PID 2412 wrote to memory of 2024	2412	cmd.exe	94
PID 2412 wrote to memory of 4872	2412	cmd.exe	95
PID 2412 wrote to memory of 4872	2412	cmd.exe	95
PID 2412 wrote to memory of 1256	2412	cmd.exe	96
PID 2412 wrote to memory of 1256	2412	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\ok.exe
"C:\Users\Admin\AppData\Local\Temp\ok.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Sets service image path in registry
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: LoadsDriver
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:624
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c certutil -hashfile "C:\Users\Admin\AppData\Local\Temp\ok.exe" MD5 | find /i /v "md5" | find /i /v "certutil"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2412
- - C:\Windows\system32\certutil.exe
    certutil -hashfile "C:\Users\Admin\AppData\Local\Temp\ok.exe" MD5
    3⤵
    PID:2024
- - C:\Windows\system32\find.exe
    find /i /v "md5"
    3⤵
    PID:4872
- - C:\Windows\system32\find.exe
    find /i /v "certutil"
    3⤵
    PID:1256

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Virtualization/Sandbox Evasion

1

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/624-0-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp

Filesize
10.7MB

Download
memory/624-1-0x00007FF902D70000-0x00007FF902F65000-memory.dmp

Filesize
2.0MB

Download
memory/624-2-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp

Filesize
10.7MB

Download
memory/624-3-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp

Filesize
10.7MB

Download
memory/624-4-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp

Filesize
10.7MB

Download
memory/624-6-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp

Filesize
10.7MB

Download
memory/624-5-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp

Filesize
10.7MB

Download
memory/624-7-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp

Filesize
10.7MB

Download
memory/624-8-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp

Filesize
10.7MB

Download
memory/624-15-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp

Filesize
10.7MB

Download
memory/624-16-0x00007FF6B05E0000-0x00007FF6B1098000-memory.dmp

Filesize
10.7MB

Download
memory/624-17-0x00007FF902D70000-0x00007FF902F65000-memory.dmp

Filesize
2.0MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads