guloader | 37d13708f889db7729c8fd162898aa6667f546de9396aaa604fb97998fbaf02a

General

Target

rRequestforQuotation_0_2025_pdf.exe
Size

879KB
MD5

3d4fd2bc7b91d6724a1b46c27a2e35b7
SHA1

afebefe8ebbe569e7efef14ae1e617418fa5b0ec
SHA256

37d13708f889db7729c8fd162898aa6667f546de9396aaa604fb97998fbaf02a
SHA512

af44ff03cc27769c57d1d89e061d3df6121c4c4cf1f7ce53b8fa1804f3d03fa2f2d2104032f6d46ac761ee1faa3c12208753139e26127988aa8d91d6216b9e81
SSDEEP

24576:QPyqE0GP4TilxAECVQntGvuCvmuReqr/sblNP9ExQ:IE0A2MGwWp/sblNVE2

Score

10^/10

guloader collection defense_evasion discovery downloader evasion spyware stealer trojan

Malware Config

Signatures

Guloader family
guloader
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader

Modifies Windows Defender DisableAntiSpyware settings 3 TTPs 1 IoCs

evasion trojan

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\DisableAntiSpyware = "1"	rRequestforQuotation_0_2025_pdf.exe

Disables Task Manager via registry modification
defense_evasion

Loads dropped DLL 2 IoCs

pid	Process
1312	rRequestforQuotation_0_2025_pdf.exe
1312	rRequestforQuotation_0_2025_pdf.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-1-5-21-2211717155-842865201-3404093980-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rRequestforQuotation_0_2025_pdf.exe
Key opened	\REGISTRY\USER\S-1-5-21-2211717155-842865201-3404093980-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rRequestforQuotation_0_2025_pdf.exe
Key opened	\REGISTRY\USER\S-1-5-21-2211717155-842865201-3404093980-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rRequestforQuotation_0_2025_pdf.exe

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

Web Service

T1102

flow	ioc
16	drive.google.com
17	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
29	checkip.dyndns.org
38	reallyfreegeoip.org
39	reallyfreegeoip.org

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4772	rRequestforQuotation_0_2025_pdf.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1312	rRequestforQuotation_0_2025_pdf.exe
4772	rRequestforQuotation_0_2025_pdf.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	rRequestforQuotation_0_2025_pdf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rRequestforQuotation_0_2025_pdf.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4772	rRequestforQuotation_0_2025_pdf.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1312	rRequestforQuotation_0_2025_pdf.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4772	rRequestforQuotation_0_2025_pdf.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1312 wrote to memory of 4772	1312	rRequestforQuotation_0_2025_pdf.exe	88
PID 1312 wrote to memory of 4772	1312	rRequestforQuotation_0_2025_pdf.exe	88
PID 1312 wrote to memory of 4772	1312	rRequestforQuotation_0_2025_pdf.exe	88
PID 1312 wrote to memory of 4772	1312	rRequestforQuotation_0_2025_pdf.exe	88

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2211717155-842865201-3404093980-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rRequestforQuotation_0_2025_pdf.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2211717155-842865201-3404093980-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rRequestforQuotation_0_2025_pdf.exe

C:\Users\Admin\AppData\Local\Temp\rRequestforQuotation_0_2025_pdf.exe
"C:\Users\Admin\AppData\Local\Temp\rRequestforQuotation_0_2025_pdf.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1312
- C:\Users\Admin\AppData\Local\Temp\rRequestforQuotation_0_2025_pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\rRequestforQuotation_0_2025_pdf.exe"
  2⤵
  - Modifies Windows Defender DisableAntiSpyware settings
  - 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:4772

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Privilege Escalation

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Defense Evasion

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

2

T1552

Credentials In Files

2

T1552.001

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\bombarderende\havs\sacrificed\Smear\rafraichisseurerne.jpg

Filesize
9KB

MD5
e83f9982d02f51d90ccb3e999ac89a95

SHA1
31a80a514244ac340625fe21fba299235f130cfc

SHA256
13cbbda804872162ff79fa0681d1dc828f803ca60247e9be06975ea21910af62

SHA512
9db2aa9509971a6e5fa9289a7f37db3cf67e4285c768e0d0181687f2f35a5d120afb70e023c2c52752b2eb58dbeadfacdf7eb303164baf77f06add2c9866f743

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsk78CB.tmp\System.dll

Filesize
11KB

MD5
a4dd044bcd94e9b3370ccf095b31f896

SHA1
17c78201323ab2095bc53184aa8267c9187d5173

SHA256
2e226715419a5882e2e14278940ee8ef0aa648a3ef7af5b3dc252674111962bc

SHA512
87335a43b9ca13e1300c7c23e702e87c669e2bcf4f6065f0c684fc53165e9c1f091cc4d79a3eca3910f0518d3b647120ac0be1a68eaade2e75eaa64adfc92c5a

Download Submit
C:\Users\Admin\subtilizer.lnk

Filesize
1KB

MD5
f0f0aa33ac830e2006278211555913f0

SHA1
bc7eaae4c271f00b35dbb1bd0a4ea92351af6156

SHA256
9aa5596db4d210b734fa056f10663cb36ff435a40e38da61a32b993022a38dc3

SHA512
072dbe0826cee55b5d3b7b9ee1290ddd8bf9886bc7b6397a35c00cea9f6cc6acfef9eda1a803fd7b779aef02402741f0499c1b67d722fa45bfba5e7a7d682eed

Download Submit
memory/1312-300-0x0000000077BA1000-0x0000000077CC1000-memory.dmp

Filesize
1.1MB

Download
memory/1312-301-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/4772-321-0x0000000001700000-0x000000000543A000-memory.dmp

Filesize
61.2MB

Download
memory/4772-323-0x00000000004A0000-0x00000000004BE000-memory.dmp

Filesize
120KB

Download
memory/4772-304-0x0000000077C28000-0x0000000077C29000-memory.dmp

Filesize
4KB

Download
memory/4772-305-0x0000000077C45000-0x0000000077C46000-memory.dmp

Filesize
4KB

Download
memory/4772-318-0x00000000004A0000-0x00000000016F4000-memory.dmp

Filesize
18.3MB

Download
memory/4772-319-0x00000000004A0000-0x00000000016F4000-memory.dmp

Filesize
18.3MB

Download
memory/4772-320-0x0000000077BA1000-0x0000000077CC1000-memory.dmp

Filesize
1.1MB

Download
memory/4772-302-0x0000000001700000-0x000000000543A000-memory.dmp

Filesize
61.2MB

Download
memory/4772-322-0x0000000072A9E000-0x0000000072A9F000-memory.dmp

Filesize
4KB

Download
memory/4772-303-0x0000000077BA1000-0x0000000077CC1000-memory.dmp

Filesize
1.1MB

Download
memory/4772-324-0x0000000038270000-0x0000000038814000-memory.dmp

Filesize
5.6MB

Download
memory/4772-325-0x00000000381B0000-0x000000003824C000-memory.dmp

Filesize
624KB

Download
memory/4772-326-0x0000000072A90000-0x0000000073240000-memory.dmp

Filesize
7.7MB

Download
memory/4772-328-0x0000000038C70000-0x0000000038D02000-memory.dmp

Filesize
584KB

Download
memory/4772-329-0x00000000388C0000-0x0000000038910000-memory.dmp

Filesize
320KB

Download
memory/4772-330-0x0000000072A9E000-0x0000000072A9F000-memory.dmp

Filesize
4KB

Download
memory/4772-331-0x0000000072A90000-0x0000000073240000-memory.dmp

Filesize
7.7MB

Download
memory/4772-332-0x0000000038E40000-0x0000000039002000-memory.dmp

Filesize
1.8MB

Download
memory/4772-333-0x0000000039060000-0x000000003906A000-memory.dmp

Filesize
40KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads