guloader | 00b33c93902d9cb8722957b2512a45196b37284ffd85489e74d973aae7ec1962

Analysis

max time kernel
146s
max time network
146s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
19-11-2024 05:20

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General

Target

Korrekturlsning.exe
Size

564KB
MD5

092db8e9c1a9c370510f7e33067be9bf
SHA1

38204269d191f5b7745932f8ca05af8c13cba110
SHA256

00b33c93902d9cb8722957b2512a45196b37284ffd85489e74d973aae7ec1962
SHA512

86daa82ad2ff52c35e4e6e13da0ef11da3243ccd56d79614628bf7b7533fc05f23755ca80540c2ec02ed247574c8e653ef0f91c60b58e7f32d092446f9098b2f
SSDEEP

12288:32EIBt4q0c1yIPM9M3NFNPvJlQfkHphGvOvz28i2cK5L/jM+qImd3ZhZU:3wBGLYP1Jlmgph42a8bvTfPmdPZU

Score

10^/10

guloader vipkeylogger collection discovery downloader keylogger persistence spyware stealer

Malware Config

Extracted

Family

vipkeylogger

https://api.telegram.org/bot8124032214:AAHsMb8ZSRX6oiufFz1tRalXrmGjYujuzB4/sendMessage?chat_id=6198188190

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 1 IoCs

pid	Process
4820	Korrekturlsning.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-1-5-21-940901362-3608833189-1915618603-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Korrekturlsning.exe
Key opened	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Korrekturlsning.exe
Key opened	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Korrekturlsning.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Rytmiserendes = "C:\\Users\\Admin\\AppData\\Local\\Temp\\nonconsumption\\Oraklerne100.exe"	Korrekturlsning.exe

Looks up external IP address via web service 1 IoCs

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

flow	ioc
21	checkip.dyndns.org

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
740	Korrekturlsning.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4820	Korrekturlsning.exe
740	Korrekturlsning.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4820 set thread context of 740	4820	Korrekturlsning.exe	93

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\0409\slnger\barometerstandenes.san	Korrekturlsning.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	Korrekturlsning.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Korrekturlsning.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
740	Korrekturlsning.exe
740	Korrekturlsning.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4820	Korrekturlsning.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	740	Korrekturlsning.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4820 wrote to memory of 740	4820	Korrekturlsning.exe	93
PID 4820 wrote to memory of 740	4820	Korrekturlsning.exe	93
PID 4820 wrote to memory of 740	4820	Korrekturlsning.exe	93
PID 4820 wrote to memory of 740	4820	Korrekturlsning.exe	93
PID 4820 wrote to memory of 740	4820	Korrekturlsning.exe	93

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Korrekturlsning.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Korrekturlsning.exe

C:\Users\Admin\AppData\Local\Temp\Korrekturlsning.exe
"C:\Users\Admin\AppData\Local\Temp\Korrekturlsning.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4820
- C:\Users\Admin\AppData\Local\Temp\Korrekturlsning.exe
  "C:\Users\Admin\AppData\Local\Temp\Korrekturlsning.exe"
  2⤵
  - Accesses Microsoft Outlook profiles
  - Adds Run key to start application
  - 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:740

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

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

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsh8C14.tmp\System.dll

Filesize
11KB

MD5
75ed96254fbf894e42058062b4b4f0d1

SHA1
996503f1383b49021eb3427bc28d13b5bbd11977

SHA256
a632d74332b3f08f834c732a103dafeb09a540823a2217ca7f49159755e8f1d7

SHA512
58174896db81d481947b8745dafe3a02c150f3938bb4543256e8cce1145154e016d481df9fe68dac6d48407c62cbe20753320ebd5fe5e84806d07ce78e0eb0c4

Download Submit
memory/740-20-0x00000000378B0000-0x0000000037A72000-memory.dmp

Filesize
1.8MB

Download
memory/740-15-0x00000000007E0000-0x0000000001A34000-memory.dmp

Filesize
18.3MB

Download
memory/740-27-0x00000000381F0000-0x00000000381FA000-memory.dmp

Filesize
40KB

Download
memory/740-26-0x0000000038100000-0x0000000038192000-memory.dmp

Filesize
584KB

Download
memory/740-17-0x0000000036B40000-0x00000000370E4000-memory.dmp

Filesize
5.6MB

Download
memory/740-14-0x00000000007E0000-0x0000000001A34000-memory.dmp

Filesize
18.3MB

Download
memory/740-22-0x0000000037B80000-0x00000000380AC000-memory.dmp

Filesize
5.2MB

Download
memory/740-16-0x00000000007E0000-0x000000000082A000-memory.dmp

Filesize
296KB

Download
memory/740-12-0x0000000001A40000-0x000000000410E000-memory.dmp

Filesize
38.8MB

Download
memory/740-18-0x0000000037130000-0x00000000371CC000-memory.dmp

Filesize
624KB

Download
memory/740-19-0x0000000001A40000-0x000000000410E000-memory.dmp

Filesize
38.8MB

Download
memory/740-21-0x0000000037AA0000-0x0000000037AF0000-memory.dmp

Filesize
320KB

Download
memory/4820-8-0x0000000002DF0000-0x00000000054BE000-memory.dmp

Filesize
38.8MB

Download
memory/4820-9-0x00000000779A1000-0x0000000077AC1000-memory.dmp

Filesize
1.1MB

Download
memory/4820-11-0x0000000002DF0000-0x00000000054BE000-memory.dmp

Filesize
38.8MB

Download
memory/4820-10-0x0000000074694000-0x0000000074695000-memory.dmp

Filesize
4KB

Download