Malware Analysis Report

2025-08-10 19:27

Sample ID 230712-l4dekscg42
Target pdf.exe
SHA256 dcd849401b6834b4c36006567cbf2e9bcc2093849432a104ff43d178867d397d
Tags
guloader discovery downloader
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

dcd849401b6834b4c36006567cbf2e9bcc2093849432a104ff43d178867d397d

Threat Level: Known bad

The file pdf.exe was found to be: Known bad.

Malicious Activity Summary

guloader discovery downloader

Guloader,Cloudeye

Loads dropped DLL

Checks computer location settings

Checks QEMU agent file

Checks installed software on the system

Legitimate hosting services abused for malware hosting/C2

Suspicious use of SetThreadContext

Drops file in System32 directory

Suspicious use of NtCreateThreadExHideFromDebugger

Suspicious use of NtSetInformationThreadHideFromDebugger

Drops file in Program Files directory

Unsigned PE

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: MapViewOfSection

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2023-07-12 10:04

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-07-12 10:04

Reported

2023-07-12 10:10

Platform

win7-20230703-en

Max time kernel

297s

Max time network

196s

Command Line

"C:\Users\Admin\AppData\Local\Temp\pdf.exe"

Signatures

Guloader,Cloudeye

downloader guloader

Checks QEMU agent file

Description Indicator Process Target
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1305762978-1813183296-1799492538-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Checks installed software on the system

discovery

Legitimate hosting services abused for malware hosting/C2

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\Mdelokalernes72\Oscillators\Burghbote\Orwellian.Pro C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1496 set thread context of 2268 N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe C:\Users\Admin\AppData\Local\Temp\pdf.exe
PID 2268 set thread context of 1496 N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe C:\Users\Admin\AppData\Local\Temp\pdf.exe

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files (x86)\Common Files\Bismark\Salaamed\Bundgarnsfiskernes\appelret.ini C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\pdf.exe

"C:\Users\Admin\AppData\Local\Temp\pdf.exe"

C:\Users\Admin\AppData\Local\Temp\pdf.exe

"C:\Users\Admin\AppData\Local\Temp\pdf.exe"

C:\Windows\SysWOW64\cscript.exe

"C:\Windows\SysWOW64\cscript.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 drive.google.com udp
NL 172.217.168.238:443 drive.google.com tcp
US 8.8.8.8:53 doc-04-0k-docs.googleusercontent.com udp
NL 142.251.36.1:443 doc-04-0k-docs.googleusercontent.com tcp

Files

\Users\Admin\AppData\Local\Temp\nst3B7C.tmp\System.dll

MD5 17ed1c86bd67e78ade4712be48a7d2bd
SHA1 1cc9fe86d6d6030b4dae45ecddce5907991c01a0
SHA256 bd046e6497b304e4ea4ab102cab2b1f94ce09bde0eebba4c59942a732679e4eb
SHA512 0cbed521e7d6d1f85977b3f7d3ca7ac34e1b5495b69fd8c7bfa1a846baf53b0ecd06fe1ad02a3599082ffacaf8c71a3bb4e32dec05f8e24859d736b828092cd5

memory/1496-63-0x0000000002760000-0x0000000003E6D000-memory.dmp

memory/1496-64-0x0000000002760000-0x0000000003E6D000-memory.dmp

memory/2268-65-0x0000000000400000-0x0000000001462000-memory.dmp

memory/2268-66-0x0000000001470000-0x0000000002B7D000-memory.dmp

memory/2268-67-0x0000000000400000-0x0000000001462000-memory.dmp

memory/2268-88-0x0000000000400000-0x0000000001462000-memory.dmp

memory/2268-89-0x0000000001470000-0x0000000002B7D000-memory.dmp

memory/1496-91-0x0000000003F70000-0x0000000004040000-memory.dmp

memory/2268-92-0x0000000001470000-0x0000000002B7D000-memory.dmp

memory/2268-93-0x0000000033050000-0x0000000033353000-memory.dmp

memory/2268-94-0x0000000000400000-0x0000000001462000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-07-12 10:04

Reported

2023-07-12 10:10

Platform

win10v2004-20230703-en

Max time kernel

297s

Max time network

294s

Command Line

"C:\Users\Admin\AppData\Local\Temp\pdf.exe"

Signatures

Guloader,Cloudeye

downloader guloader

Checks QEMU agent file

Description Indicator Process Target
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1722984668-1829624581-3022101259-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Checks installed software on the system

discovery

Legitimate hosting services abused for malware hosting/C2

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\Mdelokalernes72\Oscillators\Burghbote\Orwellian.Pro C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4220 set thread context of 3220 N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe C:\Users\Admin\AppData\Local\Temp\pdf.exe

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files (x86)\Common Files\Bismark\Salaamed\Bundgarnsfiskernes\appelret.ini C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\pdf.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\pdf.exe

"C:\Users\Admin\AppData\Local\Temp\pdf.exe"

C:\Users\Admin\AppData\Local\Temp\pdf.exe

"C:\Users\Admin\AppData\Local\Temp\pdf.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
US 8.8.8.8:53 112.208.253.8.in-addr.arpa udp
US 8.8.8.8:53 138.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 45.19.74.20.in-addr.arpa udp
US 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 drive.google.com udp
NL 172.217.168.238:443 drive.google.com tcp
US 8.8.8.8:53 238.168.217.172.in-addr.arpa udp
US 8.8.8.8:53 doc-04-0k-docs.googleusercontent.com udp
NL 142.251.36.1:443 doc-04-0k-docs.googleusercontent.com tcp
US 8.8.8.8:53 1.36.251.142.in-addr.arpa udp
US 8.8.8.8:53 64.13.109.52.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 76.121.18.2.in-addr.arpa udp
US 8.8.8.8:53 210.143.182.52.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nswCA17.tmp\System.dll

MD5 17ed1c86bd67e78ade4712be48a7d2bd
SHA1 1cc9fe86d6d6030b4dae45ecddce5907991c01a0
SHA256 bd046e6497b304e4ea4ab102cab2b1f94ce09bde0eebba4c59942a732679e4eb
SHA512 0cbed521e7d6d1f85977b3f7d3ca7ac34e1b5495b69fd8c7bfa1a846baf53b0ecd06fe1ad02a3599082ffacaf8c71a3bb4e32dec05f8e24859d736b828092cd5

memory/4220-141-0x0000000002AD0000-0x00000000041DD000-memory.dmp

memory/4220-142-0x0000000002AD0000-0x00000000041DD000-memory.dmp

memory/3220-143-0x0000000000400000-0x0000000001654000-memory.dmp

memory/3220-144-0x0000000001660000-0x0000000002D6D000-memory.dmp

memory/3220-157-0x0000000000400000-0x0000000001654000-memory.dmp

memory/3220-158-0x0000000000400000-0x0000000001654000-memory.dmp

memory/3220-159-0x0000000001660000-0x0000000002D6D000-memory.dmp

memory/3220-160-0x0000000001660000-0x0000000002D6D000-memory.dmp

memory/3220-161-0x00000000332A0000-0x00000000335EA000-memory.dmp

memory/3220-162-0x0000000000400000-0x0000000001654000-memory.dmp