bluefox | 50a20d968ac12ec915b3d12d57feea7c8ce1cbc5e0ec79c678fe2194edd34d21

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 5 IoCs

Processes:

resource	yara_rule
behavioral1/memory/916-55-0x00000000001F0000-0x00000000007D3000-memory.dmp	family_bluefox
behavioral1/memory/916-56-0x00000000001F0000-0x00000000007D3000-memory.dmp	family_bluefox
behavioral1/memory/1672-62-0x00000000001F0000-0x00000000007D3000-memory.dmp	family_bluefox
behavioral1/memory/1672-63-0x00000000001F0000-0x00000000007D3000-memory.dmp	family_bluefox
behavioral1/memory/1672-66-0x00000000001F0000-0x00000000007D3000-memory.dmp	family_bluefox

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

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Processes:

Setup.exeSetup.exe

description ioc process

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

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

Checks BIOS information in registry 2 TTPs 4 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

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

Themida packer 5 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral1/memory/916-55-0x00000000001F0000-0x00000000007D3000-memory.dmp	themida
behavioral1/memory/916-56-0x00000000001F0000-0x00000000007D3000-memory.dmp	themida
behavioral1/memory/1672-62-0x00000000001F0000-0x00000000007D3000-memory.dmp	themida
behavioral1/memory/1672-63-0x00000000001F0000-0x00000000007D3000-memory.dmp	themida
behavioral1/memory/1672-66-0x00000000001F0000-0x00000000007D3000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

Setup.exeSetup.exe

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

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

Setup.exeSetup.exe

pid process

916 Setup.exe
1672 Setup.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

Setup.exeSetup.exe

pid process

916 Setup.exe
1672 Setup.exe

pid	process
916	Setup.exe
1672	Setup.exe

pid	process
916	Setup.exe
1672	Setup.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

AUDIODG.EXE

description	pid	process
Token: 33	276	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	276	AUDIODG.EXE
Token: 33	276	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	276	AUDIODG.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:916

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:1724

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0xc4
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:276

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:1672

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

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

Replay Monitor

Loading Replay Monitor...

Downloads

memory/916-54-0x0000000075DF1000-0x0000000075DF3000-memory.dmp

Filesize
8KB

Download
memory/916-55-0x00000000001F0000-0x00000000007D3000-memory.dmp

Filesize
5.9MB

Download
memory/916-56-0x00000000001F0000-0x00000000007D3000-memory.dmp

Filesize
5.9MB

Download
memory/916-57-0x0000000076EF0000-0x0000000077070000-memory.dmp

Filesize
1.5MB

Download
memory/916-58-0x0000000073CC0000-0x000000007426B000-memory.dmp

Filesize
5.7MB

Download
memory/916-59-0x0000000073CC0000-0x000000007426B000-memory.dmp

Filesize
5.7MB

Download
memory/1672-64-0x0000000076EF0000-0x0000000077070000-memory.dmp

Filesize
1.5MB

Download
memory/1672-62-0x00000000001F0000-0x00000000007D3000-memory.dmp

Filesize
5.9MB

Download
memory/1672-63-0x00000000001F0000-0x00000000007D3000-memory.dmp

Filesize
5.9MB

Download
memory/1672-65-0x0000000073CC0000-0x000000007426B000-memory.dmp

Filesize
5.7MB

Download
memory/1672-66-0x00000000001F0000-0x00000000007D3000-memory.dmp

Filesize
5.9MB

Download
memory/1672-67-0x0000000076EF0000-0x0000000077070000-memory.dmp

Filesize
1.5MB

Download
memory/1672-68-0x0000000073CC0000-0x000000007426B000-memory.dmp

Filesize
5.7MB

Download
memory/1724-60-0x000007FEFB731000-0x000007FEFB733000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads