guloader | 510877d9cee23c4fc8a3f0a96b12a175f1dbe887978f43499eb1cc2d05571ffb

Analysis

max time kernel
146s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20250217-en
resource tags

arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system
submitted
18-02-2025 14:00

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General

Target

Polylogy.exe
Size

990KB
MD5

7661aaf5dbaccb77ebf948bc69b5725d
SHA1

791ccb6267488a0d86891ae25be93a36a6b5bedd
SHA256

510877d9cee23c4fc8a3f0a96b12a175f1dbe887978f43499eb1cc2d05571ffb
SHA512

19cad72428ed242a9c5d743ade6ed3486a8d2454cd98d555d2b2df3f77848162bf1a1dbba0bbfd8d5f39676ff0d82dc0ea87efa73a80f9680eaad7ba7a5eb7c0
SSDEEP

24576:IGhzpxfOytYgk/ZLpIK3MrFNbMUqkpg7bII6vJ2FYMU07m1iQ:zrKz/irFNb+k2bsxTt8mkQ

Score

10^/10

guloader vipkeylogger collection discovery downloader keylogger spyware stealer

Malware Config

Extracted

Family

vipkeylogger

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
3796	Polylogy.exe
3796	Polylogy.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-1-5-21-1874072718-2205492803-118941907-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Polylogy.exe
Key opened	\REGISTRY\USER\S-1-5-21-1874072718-2205492803-118941907-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Polylogy.exe
Key opened	\REGISTRY\USER\S-1-5-21-1874072718-2205492803-118941907-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Polylogy.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
19	reallyfreegeoip.org
14	checkip.dyndns.org
17	reallyfreegeoip.org

Drops file in System32 directory 1 IoCs

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

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
1652	Polylogy.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3796	Polylogy.exe
1652	Polylogy.exe

Drops file in Program Files directory 1 IoCs

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

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\fremmder\ifaldne.lev	Polylogy.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	Polylogy.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Polylogy.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1652	Polylogy.exe
1652	Polylogy.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3796	Polylogy.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1652	Polylogy.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3796 wrote to memory of 1652	3796	Polylogy.exe	82
PID 3796 wrote to memory of 1652	3796	Polylogy.exe	82
PID 3796 wrote to memory of 1652	3796	Polylogy.exe	82
PID 3796 wrote to memory of 1652	3796	Polylogy.exe	82

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1874072718-2205492803-118941907-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Polylogy.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1874072718-2205492803-118941907-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Polylogy.exe

C:\Users\Admin\AppData\Local\Temp\Polylogy.exe
"C:\Users\Admin\AppData\Local\Temp\Polylogy.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:3796
- C:\Users\Admin\AppData\Local\Temp\Polylogy.exe
  "C:\Users\Admin\AppData\Local\Temp\Polylogy.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:1652

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
e41019686a34655f9b279b5699607e36

SHA1
1473010f4de6585f5164771fde4bcaf9d36b5fb6

SHA256
13b0190569ec0f69cde32ccbf4a488a7d738e932c6e7c8a88f9e114a4a44f049

SHA512
cdd5f7dbeaa5f58d3fd17541a0f2c791f33d81dc24ccca39eafb299cc3a0ff1a7e6b0f170fd34217a0d0340d043195068adc468c8570afe16c15bb54b07428f3

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsj830D.tmp\System.dll

Filesize
11KB

MD5
b853d5d2361ade731e33e882707efc34

SHA1
c58b1aeabdf1cbb8334ef8797e7aceaa7a1cb6be

SHA256
f0cd96e0b6e40f92ad1aa0efacde833bae807b92fca19bf062c1cf8acf29484b

SHA512
8ea31d82ffa6f58dab5632fe72690d3a6db0be65aec85fc8a1f71626773c0974dcebefae17bcf67c4c56ef442545e985eea0b348ff6e4fc36740640092b08d69

Download Submit
memory/1652-335-0x00000000725FE000-0x00000000725FF000-memory.dmp

Filesize
4KB

Download
memory/1652-348-0x0000000039470000-0x000000003947A000-memory.dmp

Filesize
40KB

Download
memory/1652-336-0x0000000000480000-0x00000000004CA000-memory.dmp

Filesize
296KB

Download
memory/1652-315-0x00000000016E0000-0x00000000051DD000-memory.dmp

Filesize
59.0MB

Download
memory/1652-316-0x0000000077881000-0x00000000779A1000-memory.dmp

Filesize
1.1MB

Download
memory/1652-317-0x0000000077908000-0x0000000077909000-memory.dmp

Filesize
4KB

Download
memory/1652-318-0x0000000077925000-0x0000000077926000-memory.dmp

Filesize
4KB

Download
memory/1652-331-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/1652-332-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/1652-337-0x0000000038070000-0x0000000038614000-memory.dmp

Filesize
5.6MB

Download
memory/1652-347-0x0000000039380000-0x0000000039412000-memory.dmp

Filesize
584KB

Download
memory/1652-345-0x0000000038E00000-0x000000003932C000-memory.dmp

Filesize
5.2MB

Download
memory/1652-333-0x0000000077881000-0x00000000779A1000-memory.dmp

Filesize
1.1MB

Download
memory/1652-338-0x0000000038620000-0x00000000386BC000-memory.dmp

Filesize
624KB

Download
memory/1652-339-0x00000000725F0000-0x0000000072DA0000-memory.dmp

Filesize
7.7MB

Download
memory/1652-334-0x00000000016E0000-0x00000000051DD000-memory.dmp

Filesize
59.0MB

Download
memory/1652-341-0x00000000725FE000-0x00000000725FF000-memory.dmp

Filesize
4KB

Download
memory/1652-342-0x00000000725F0000-0x0000000072DA0000-memory.dmp

Filesize
7.7MB

Download
memory/1652-343-0x0000000038B30000-0x0000000038CF2000-memory.dmp

Filesize
1.8MB

Download
memory/1652-344-0x0000000038D20000-0x0000000038D70000-memory.dmp

Filesize
320KB

Download
memory/3796-313-0x0000000077881000-0x00000000779A1000-memory.dmp

Filesize
1.1MB

Download
memory/3796-314-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/3796-312-0x0000000077881000-0x00000000779A1000-memory.dmp

Filesize
1.1MB

Download