guloader | 9f1c29d71c3ba577909f35f0c0f03e407f79eca96cf77023d91f32f4218c6868

General

Target

Bibliofils.exe
Size

989KB
MD5

abfd25dac0abc339e2d1cf94b062f035
SHA1

5a319213e77889dab7ccbdb8a71dd7f3480a006b
SHA256

9f1c29d71c3ba577909f35f0c0f03e407f79eca96cf77023d91f32f4218c6868
SHA512

0972e57bde271cc14d1d1d49c972fec5766203bf7ed019a0662c91ef29c9fccd1dd25b9b46238b5bcb32b934334099d5eac85dcaa5af8a424bd1ad2e7aade5ef
SSDEEP

24576:3Gtpx9zER2RqGgLnNX9XG2rhtAtdx4WA4j:CBEcANX9r2xlA0

Score

10^/10

guloader vipkeylogger discovery downloader keylogger stealer

Malware Config

Extracted

Family

vipkeylogger

C2

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
1448	Bibliofils.exe
1448	Bibliofils.exe

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

Web Service

T1102

flow	ioc
3	drive.google.com
4	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
1932	Bibliofils.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1448	Bibliofils.exe
1932	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

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 1 IoCs

pid	Process
1932	Bibliofils.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1448	Bibliofils.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1932	Bibliofils.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1448 wrote to memory of 1932	1448	Bibliofils.exe	30
PID 1448 wrote to memory of 1932	1448	Bibliofils.exe	30
PID 1448 wrote to memory of 1932	1448	Bibliofils.exe	30
PID 1448 wrote to memory of 1932	1448	Bibliofils.exe	30
PID 1448 wrote to memory of 1932	1448	Bibliofils.exe	30

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:1448
- C:\Users\Admin\AppData\Local\Temp\Bibliofils.exe
  "C:\Users\Admin\AppData\Local\Temp\Bibliofils.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1932

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
1KB

MD5
624c6382aa86cc5e3717bacf42b5d726

SHA1
0b35c8f4ae074bd83226de82fbee86b0805a349d

SHA256
809216b307f5eea1e9cacd518577c2a25f68906ad5dd0796b46b361c9effec24

SHA512
895887eaaf4cb6fee095479c9af909a3934ec02c312eee5518db44e4f8960ba7e1c86ece9fba5a7b9b48e600c1a8330d0ca5c6c67b53f8996bee0eaf898402e7

Download Submit
\Users\Admin\AppData\Local\Temp\nsjF421.tmp\System.dll

Filesize
11KB

MD5
b853d5d2361ade731e33e882707efc34

SHA1
c58b1aeabdf1cbb8334ef8797e7aceaa7a1cb6be

SHA256
f0cd96e0b6e40f92ad1aa0efacde833bae807b92fca19bf062c1cf8acf29484b

SHA512
8ea31d82ffa6f58dab5632fe72690d3a6db0be65aec85fc8a1f71626773c0974dcebefae17bcf67c4c56ef442545e985eea0b348ff6e4fc36740640092b08d69

Download Submit
memory/1448-312-0x0000000003450000-0x0000000004B58000-memory.dmp

Filesize
23.0MB

Download
memory/1448-313-0x0000000076F21000-0x0000000077022000-memory.dmp

Filesize
1.0MB

Download
memory/1448-314-0x0000000076F20000-0x00000000770C9000-memory.dmp

Filesize
1.7MB

Download
memory/1448-315-0x0000000003450000-0x0000000004B58000-memory.dmp

Filesize
23.0MB

Download
memory/1448-318-0x0000000003450000-0x0000000004B58000-memory.dmp

Filesize
23.0MB

Download
memory/1932-317-0x0000000076F20000-0x00000000770C9000-memory.dmp

Filesize
1.7MB

Download
memory/1932-340-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/1932-341-0x00000000014F0000-0x0000000002BF8000-memory.dmp

Filesize
23.0MB

Download
memory/1932-342-0x0000000000480000-0x00000000004CA000-memory.dmp

Filesize
296KB

Download

Analysis

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