guloader | 9f1c29d71c3ba577909f35f0c0f03e407f79eca96cf77023d91f32f4218c6868

Analysis

max time kernel
140s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20250217-en
resource tags

arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system
submitted
17-02-2025 18:07

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General

Target

Bibliofils.exe
Size

989KB
MD5

abfd25dac0abc339e2d1cf94b062f035
SHA1

5a319213e77889dab7ccbdb8a71dd7f3480a006b
SHA256

9f1c29d71c3ba577909f35f0c0f03e407f79eca96cf77023d91f32f4218c6868
SHA512

0972e57bde271cc14d1d1d49c972fec5766203bf7ed019a0662c91ef29c9fccd1dd25b9b46238b5bcb32b934334099d5eac85dcaa5af8a424bd1ad2e7aade5ef
SSDEEP

24576:3Gtpx9zER2RqGgLnNX9XG2rhtAtdx4WA4j:CBEcANX9r2xlA0

Score

10^/10

guloader vipkeylogger collection discovery downloader keylogger spyware stealer

Malware Config

Extracted

Family

vipkeylogger

https://api.telegram.org/bot7618867847:AAF14vnGvkJJYcxLyMVdR3OZPzd4TQzD_OY/sendMessage?chat_id=6070006284

Signatures

Guloader family
guloader
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
VIPKeylogger
VIPKeylogger is a keylogger and infostealer written in C# and it resembles SnakeKeylogger that was found in 2020.
stealer keylogger vipkeylogger
Vipkeylogger family
vipkeylogger

Loads dropped DLL 2 IoCs

pid	Process
2952	Bibliofils.exe
2952	Bibliofils.exe

Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-250031470-1197856012-2659781506-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Bibliofils.exe
Key opened	\REGISTRY\USER\S-1-5-21-250031470-1197856012-2659781506-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Bibliofils.exe
Key opened	\REGISTRY\USER\S-1-5-21-250031470-1197856012-2659781506-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Bibliofils.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
1	drive.google.com
3	drive.google.com

Looks up external IP address via web service 3 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
15	checkip.dyndns.org
18	reallyfreegeoip.org
19	reallyfreegeoip.org

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\revyviserne\Tilbed.ini	Bibliofils.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2180	Bibliofils.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2952	Bibliofils.exe
2180	Bibliofils.exe

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\delarbejderne.nar	Bibliofils.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\fremmder\ifaldne.lev	Bibliofils.exe

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217
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 2 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	Bibliofils.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Bibliofils.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2180	Bibliofils.exe
2180	Bibliofils.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2952	Bibliofils.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2180	Bibliofils.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2952 wrote to memory of 2180	2952	Bibliofils.exe	80
PID 2952 wrote to memory of 2180	2952	Bibliofils.exe	80
PID 2952 wrote to memory of 2180	2952	Bibliofils.exe	80
PID 2952 wrote to memory of 2180	2952	Bibliofils.exe	80

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-250031470-1197856012-2659781506-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Bibliofils.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-250031470-1197856012-2659781506-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Bibliofils.exe

C:\Users\Admin\AppData\Local\Temp\Bibliofils.exe
"C:\Users\Admin\AppData\Local\Temp\Bibliofils.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2952
- C:\Users\Admin\AppData\Local\Temp\Bibliofils.exe
  "C:\Users\Admin\AppData\Local\Temp\Bibliofils.exe"
  2⤵
  - Accesses Microsoft Outlook profiles
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - outlook_office_path
  - outlook_win_path
  PID:2180

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Browser Information Discovery

T1217

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\ProgramData\Microsoft\Windows\Templates\dinosaurusserne.lnk

Filesize
1KB

MD5
8382ca89f880a8574d7732fcbb93cd3a

SHA1
c12c08cf6b075d81db5990d8083938635e2275a7

SHA256
27b5bca0d042927c3fc58eb891a9a401c3f1f66269108e0bb9c6d5a43c5d4a56

SHA512
9b2daa99a2f51af7265672b202b8c3be40384d0c70cb45639ec327f09ff509fc172c0012a9221c32b83918f41a7dfb5ad95b2974822cd1ea7fe8d56587e7cd4c

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsbC99B.tmp\System.dll

Filesize
11KB

MD5
b853d5d2361ade731e33e882707efc34

SHA1
c58b1aeabdf1cbb8334ef8797e7aceaa7a1cb6be

SHA256
f0cd96e0b6e40f92ad1aa0efacde833bae807b92fca19bf062c1cf8acf29484b

SHA512
8ea31d82ffa6f58dab5632fe72690d3a6db0be65aec85fc8a1f71626773c0974dcebefae17bcf67c4c56ef442545e985eea0b348ff6e4fc36740640092b08d69

Download Submit
memory/2180-337-0x0000000000480000-0x00000000004CA000-memory.dmp

Filesize
296KB

Download
memory/2180-335-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/2180-347-0x0000000033670000-0x000000003367A000-memory.dmp

Filesize
40KB

Download
memory/2180-346-0x00000000335B0000-0x0000000033642000-memory.dmp

Filesize
584KB

Download
memory/2180-316-0x00000000016E0000-0x0000000002DE8000-memory.dmp

Filesize
23.0MB

Download
memory/2180-317-0x00000000016E0000-0x0000000002DE8000-memory.dmp

Filesize
23.0MB

Download
memory/2180-318-0x0000000077198000-0x0000000077199000-memory.dmp

Filesize
4KB

Download
memory/2180-319-0x00000000771B5000-0x00000000771B6000-memory.dmp

Filesize
4KB

Download
memory/2180-320-0x00000000016E0000-0x0000000002DE8000-memory.dmp

Filesize
23.0MB

Download
memory/2180-327-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/2180-331-0x0000000077111000-0x0000000077231000-memory.dmp

Filesize
1.1MB

Download
memory/2180-344-0x0000000036A10000-0x0000000036F3C000-memory.dmp

Filesize
5.2MB

Download
memory/2180-336-0x00000000016E0000-0x0000000002DE8000-memory.dmp

Filesize
23.0MB

Download
memory/2180-343-0x0000000036930000-0x0000000036980000-memory.dmp

Filesize
320KB

Download
memory/2180-338-0x0000000035D80000-0x0000000036324000-memory.dmp

Filesize
5.6MB

Download
memory/2180-339-0x0000000035B80000-0x0000000035C1C000-memory.dmp

Filesize
624KB

Download
memory/2180-342-0x0000000036740000-0x0000000036902000-memory.dmp

Filesize
1.8MB

Download
memory/2952-312-0x0000000003180000-0x0000000004888000-memory.dmp

Filesize
23.0MB

Download
memory/2952-313-0x0000000077111000-0x0000000077231000-memory.dmp

Filesize
1.1MB

Download
memory/2952-315-0x0000000003180000-0x0000000004888000-memory.dmp

Filesize
23.0MB

Download
memory/2952-314-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download