bluefox | 52ce44430e91b06b57d0b1486918b75ac9c5c4bfd3454cff095dd47e23a029fe

Analysis

max time kernel
156s
max time network
161s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
24-04-2023 08:52

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General

Target

Setup.exe
Size

376.3MB
MD5

38eb2b2611ed105e0a1bb9e331abb038
SHA1

fa05ff8ecca6a42e15e1218c423316a7cad3674a
SHA256

08e4f43424b6845ea482ac01d1094d883a1d18b631669a4d9627c77dbf7acf76
SHA512

e33128a3f516c6dc903850090b546f764182a46f38563faf57029e861ae165ce45ca713c99d26a16d6cc1e3ae0d6e7c3e2c990d3b7f2a393d12243b72aa7a3a8
SSDEEP

49152:XToqRjktHN+cEUoqJCCudWoCoRXb2YP4Fu7iHeCNVrMqaXsd4AC:jTRAB7Ci5OXb2YP4Fu7+eCNVwqxd4AC

Score

10^/10

bluefox evasion stealer themida trojan

Malware Config

Signatures

BlueFox
BlueFox is an infostealer written in C# and first seen in December 2021.
stealer bluefox

BlueFox Stealer payload 3 IoCs

Processes:

resource	yara_rule
behavioral2/memory/536-134-0x0000000000960000-0x0000000000F43000-memory.dmp	family_bluefox
behavioral2/memory/536-136-0x0000000001480000-0x0000000001490000-memory.dmp	family_bluefox
behavioral2/memory/536-139-0x0000000000960000-0x0000000000F43000-memory.dmp	family_bluefox

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

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Processes:

Setup.exe

description ioc process

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

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	Setup.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:

Setup.exe

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

Themida packer 3 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral2/memory/536-133-0x0000000000960000-0x0000000000F43000-memory.dmp	themida
behavioral2/memory/536-134-0x0000000000960000-0x0000000000F43000-memory.dmp	themida
behavioral2/memory/536-139-0x0000000000960000-0x0000000000F43000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

Setup.exe

description ioc process

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

Processes:

Setup.exe

pid process

536 Setup.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

Setup.exe

pid process

536 Setup.exe
536 Setup.exe

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

pid	process
536	Setup.exe

pid	process
536	Setup.exe
536	Setup.exe

C:\Users\Admin\AppData\Local\Temp\Setup.exe
"C:\Users\Admin\AppData\Local\Temp\Setup.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 behavior: EnumeratesProcesses
PID:536

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/536-133-0x0000000000960000-0x0000000000F43000-memory.dmp

Filesize
5.9MB

Download
memory/536-134-0x0000000000960000-0x0000000000F43000-memory.dmp

Filesize
5.9MB

Download
memory/536-135-0x0000000001480000-0x0000000001490000-memory.dmp

Filesize
64KB

Download
memory/536-136-0x0000000001480000-0x0000000001490000-memory.dmp

Filesize
64KB

Download
memory/536-137-0x0000000001480000-0x0000000001490000-memory.dmp

Filesize
64KB

Download
memory/536-138-0x0000000001480000-0x0000000001490000-memory.dmp

Filesize
64KB

Download
memory/536-139-0x0000000000960000-0x0000000000F43000-memory.dmp

Filesize
5.9MB

Download
memory/536-140-0x0000000001480000-0x0000000001490000-memory.dmp

Filesize
64KB

Download
memory/536-141-0x0000000001480000-0x0000000001490000-memory.dmp

Filesize
64KB

Download
memory/536-142-0x0000000001480000-0x0000000001490000-memory.dmp

Filesize
64KB

Download
memory/536-143-0x0000000001480000-0x0000000001490000-memory.dmp

Filesize
64KB

Download
memory/536-144-0x0000000001480000-0x0000000001490000-memory.dmp

Filesize
64KB

Download