4400ba385c37b8c0ec3c63463794c2a335fe8823a0a43a910ae6400337371217

General

Target

BIGBOSS.exe
Size

36.6MB
MD5

19773de3aada9bebac1c8a284059e0a5
SHA1

482dcb8326ab158a0b054516cede9d80119dca7b
SHA256

4400ba385c37b8c0ec3c63463794c2a335fe8823a0a43a910ae6400337371217
SHA512

829ee42d011ca1064a272fc626540b5ddf115d1e59e8e107b185def9ced215b96ce3018c7ff4a8a6c30893e313c64e1df58e7771e1d2f868fcfa61c7ecd56346
SSDEEP

786432:w5iyxGxoo4kxSjEN0CgFjaj2G8NkzJD4pSbN+WYbO7fqffK:w01xoLvCgxayG8NkzJDaSbN+WY8qffK

Score

9^/10

discovery 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	BIGBOSS.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	BIGBOSS.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	BIGBOSS.exe

Themida packer 2 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral1/memory/2512-20-0x0000000000C70000-0x0000000004172000-memory.dmp	themida
behavioral1/memory/2512-21-0x0000000000C70000-0x0000000004172000-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	BIGBOSS.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2512	BIGBOSS.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	BIGBOSS.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2512	BIGBOSS.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2512	BIGBOSS.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2512 wrote to memory of 2252	2512	BIGBOSS.exe	31
PID 2512 wrote to memory of 2252	2512	BIGBOSS.exe	31
PID 2512 wrote to memory of 2252	2512	BIGBOSS.exe	31
PID 2512 wrote to memory of 2252	2512	BIGBOSS.exe	31
PID 2252 wrote to memory of 2696	2252	chrome.exe	32
PID 2252 wrote to memory of 2696	2252	chrome.exe	32
PID 2252 wrote to memory of 2696	2252	chrome.exe	32

C:\Users\Admin\AppData\Local\Temp\BIGBOSS.exe
"C:\Users\Admin\AppData\Local\Temp\BIGBOSS.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
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2512
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe" --no-startup-window --start-in-incognito
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2252
- - C:\Program Files\Google\Chrome\Application\chrome.exe
    "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=crashpad-handler "--user-data-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" /prefetch:7 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad" "--metrics-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" --url=https://clients2.google.com/cr/report --annotation=channel= --annotation=plat=Win64 --annotation=prod=Chrome --annotation=ver=106.0.5249.119 --initial-client-data=0xc0,0xc4,0xc8,0x94,0xcc,0x7fef7319758,0x7fef7319768,0x7fef7319778
    3⤵
    PID:2696

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Virtualization/Sandbox Evasion

1

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/2512-1-0x0000000076681000-0x0000000076682000-memory.dmp

Filesize
4KB

Download
memory/2512-0-0x0000000000C70000-0x0000000004172000-memory.dmp

Filesize
53.0MB

Download
memory/2512-3-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-2-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-16-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-15-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-14-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-13-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-12-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-11-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-10-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-9-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-8-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-7-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-6-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-5-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-4-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-20-0x0000000000C70000-0x0000000004172000-memory.dmp

Filesize
53.0MB

Download
memory/2512-21-0x0000000000C70000-0x0000000004172000-memory.dmp

Filesize
53.0MB

Download
memory/2512-26-0x0000000000C70000-0x0000000004172000-memory.dmp

Filesize
53.0MB

Download
memory/2512-27-0x0000000076681000-0x0000000076682000-memory.dmp

Filesize
4KB

Download
memory/2512-28-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download
memory/2512-30-0x0000000076670000-0x0000000076780000-memory.dmp

Filesize
1.1MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads