guloader | 9f1c29d71c3ba577909f35f0c0f03e407f79eca96cf77023d91f32f4218c6868

Analysis

max time kernel
149s
max time network
135s
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 18:00

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

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
1548	Bibliofils.exe
1548	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-1-5-21-22591836-1183090055-1220658180-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Bibliofils.exe
Key opened	\REGISTRY\USER\S-1-5-21-22591836-1183090055-1220658180-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Bibliofils.exe
Key opened	\REGISTRY\USER\S-1-5-21-22591836-1183090055-1220658180-1000\Software\Microsoft\Office\15.0\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
2	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
14	checkip.dyndns.org
16	reallyfreegeoip.org
17	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
1208	Bibliofils.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1548	Bibliofils.exe
1208	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
1208	Bibliofils.exe
1208	Bibliofils.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1548	Bibliofils.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1208	Bibliofils.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1548 wrote to memory of 1208	1548	Bibliofils.exe	81
PID 1548 wrote to memory of 1208	1548	Bibliofils.exe	81
PID 1548 wrote to memory of 1208	1548	Bibliofils.exe	81
PID 1548 wrote to memory of 1208	1548	Bibliofils.exe	81

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-22591836-1183090055-1220658180-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Bibliofils.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-22591836-1183090055-1220658180-1000\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:1548
- 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:1208

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

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
1KB

MD5
0a818acde6650bd58b2ae522bdb357da

SHA1
85138a42df92ae38a3f938cdeba45f9e83234b9c

SHA256
9c878cb380a8d52e120ca97465643bfd92aafe47412b9ec4812abc496abb9dbd

SHA512
f0d12e1dd8831e14997885efb5cf717c091811c02f8b76c2e9463a2680590264b46eaefa23bf3a6e6577ba88cb86f5e59807173cd6460c57ab2bc233cece53fa

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsnCCE7.tmp\System.dll

Filesize
11KB

MD5
b853d5d2361ade731e33e882707efc34

SHA1
c58b1aeabdf1cbb8334ef8797e7aceaa7a1cb6be

SHA256
f0cd96e0b6e40f92ad1aa0efacde833bae807b92fca19bf062c1cf8acf29484b

SHA512
8ea31d82ffa6f58dab5632fe72690d3a6db0be65aec85fc8a1f71626773c0974dcebefae17bcf67c4c56ef442545e985eea0b348ff6e4fc36740640092b08d69

Download Submit
memory/1208-332-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/1208-333-0x0000000077631000-0x0000000077751000-memory.dmp

Filesize
1.1MB

Download
memory/1208-345-0x0000000037080000-0x000000003708A000-memory.dmp

Filesize
40KB

Download
memory/1208-315-0x00000000016E0000-0x0000000002DE8000-memory.dmp

Filesize
23.0MB

Download
memory/1208-316-0x00000000016E0000-0x0000000002DE8000-memory.dmp

Filesize
23.0MB

Download
memory/1208-317-0x00000000776B8000-0x00000000776B9000-memory.dmp

Filesize
4KB

Download
memory/1208-318-0x00000000776D5000-0x00000000776D6000-memory.dmp

Filesize
4KB

Download
memory/1208-331-0x00000000016E0000-0x0000000002DE8000-memory.dmp

Filesize
23.0MB

Download
memory/1208-344-0x0000000036F90000-0x0000000037022000-memory.dmp

Filesize
584KB

Download
memory/1208-341-0x0000000036A10000-0x0000000036F3C000-memory.dmp

Filesize
5.2MB

Download
memory/1208-334-0x00000000016E0000-0x0000000002DE8000-memory.dmp

Filesize
23.0MB

Download
memory/1208-335-0x0000000000480000-0x00000000004CA000-memory.dmp

Filesize
296KB

Download
memory/1208-336-0x0000000035CC0000-0x0000000036264000-memory.dmp

Filesize
5.6MB

Download
memory/1208-337-0x0000000035B60000-0x0000000035BFC000-memory.dmp

Filesize
624KB

Download
memory/1208-339-0x0000000036740000-0x0000000036902000-memory.dmp

Filesize
1.8MB

Download
memory/1208-340-0x0000000036930000-0x0000000036980000-memory.dmp

Filesize
320KB

Download
memory/1548-313-0x0000000077631000-0x0000000077751000-memory.dmp

Filesize
1.1MB

Download
memory/1548-312-0x0000000003180000-0x0000000004888000-memory.dmp

Filesize
23.0MB

Download
memory/1548-314-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download