bluefox | 09dc4d3be6dce14fd4e9a99c95b5afd5d29947742053e47466d8a468d49f490e

Analysis

max time kernel
31s
max time network
142s
platform
windows7_x64
resource
win7-20230220-en
resource tags

arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
submitted
17/03/2023, 08:53

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General

Target
payload.exe
Size 867KB
Sample230317-ktgtkshc6t
SHA256 09dc4d3be6dce14fd4e9a99c95b5afd5d29947742053e47466d8a468d49f490e
MD5 673a89ca2337a34c3e377203fcbb10cf
SHA1 80bd02c2298c76303e31ae851c997ebb73788b86
SHA512 e83292db6fe9afb60d6fa5ec5da6ce2def9cd6b95660bfe1971ddcf3e7fd28a013e9b85a595e8564b27473882393da8e871fe1e32dfe06eff7734aab439a783b
SSDEEP 24576:EvgMXBy6gVm26JqzICGRTttDoEXTmbo3DE0HHhXb9D6dh0:LMX46gVV64MJZjmc3Dnhl6dG
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

bluefox spyware stealer

Malware Config

Signatures

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

BlueFox Stealer payload 1 IoCs

resource	yara_rule
behavioral1/memory/308-56-0x00000000001B0000-0x00000000001E1000-memory.dmp	family_bluefox

Deletes itself 1 IoCs

pid	Process
1384	cmd.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

Processor 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\CentralProcessor\0\ProcessorNameString	payload.exe
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	payload.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1664	timeout.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
308	payload.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	308	payload.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 308 wrote to memory of 1384	308	payload.exe	28
PID 308 wrote to memory of 1384	308	payload.exe	28
PID 308 wrote to memory of 1384	308	payload.exe	28
PID 308 wrote to memory of 1384	308	payload.exe	28
PID 1384 wrote to memory of 1664	1384	cmd.exe	30
PID 1384 wrote to memory of 1664	1384	cmd.exe	30
PID 1384 wrote to memory of 1664	1384	cmd.exe	30
PID 1384 wrote to memory of 1664	1384	cmd.exe	30

C:\Users\Admin\AppData\Local\Temp\payload.exe
"C:\Users\Admin\AppData\Local\Temp\payload.exe"
1⤵
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:308
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /C timeout 5 & del "C:\Users\Admin\AppData\Local\Temp\payload.exe"
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:1384
- - C:\Windows\SysWOW64\timeout.exe
    timeout 5
    3⤵
    - Delays execution with timeout.exe
    PID:1664

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/308-54-0x0000000000400000-0x0000000000748000-memory.dmp

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memory/308-56-0x00000000001B0000-0x00000000001E1000-memory.dmp

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memory/308-61-0x00000000023A0000-0x00000000023E0000-memory.dmp

Download

memory/308-62-0x00000000023A0000-0x00000000023E0000-memory.dmp

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memory/308-63-0x0000000000400000-0x0000000000748000-memory.dmp

Download

memory/308-64-0x0000000000400000-0x0000000000748000-memory.dmp

Download