guloader | 7861a056a2451cb107a0f489df465ea836cb57d8921dac618db52d62bf349df3

Analysis

max time kernel
40s
max time network
38s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260629-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260629-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
02/07/2026, 10:31

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General

Target
001002998384756_pdf.exe
Size 438KB
Sample260702-mkb8vaf14w
SHA256 7861a056a2451cb107a0f489df465ea836cb57d8921dac618db52d62bf349df3
MD5 dd41baba80d0a2af43c82141444c5122
SHA1 93c884d47a47dcf65c87ae3e28b80558d23a201b
SHA512 1dbc2ce888c1ff0254ecbfeb7a84901e6afa02f584963ff8e0fbe155b1b01f51354c8cdde3c24103c3a4db0806c30f4e06be96159842de4d8f022bd8679dc161
SSDEEP 6144:fXsKoGSLxIxDZzoJDGj90YskfccUPZqOidAoJkY3vA64cZbXCi/mLPmvLX6frOzO:fX1xliGj908+PBid9JkYfKcZ6LE6OzO
TLSH
T19DA4F1293EE9C916D2609D75C9B9D7F92C796E90ECC4861BBE7C7E043A331BD2901093
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery downloader guloader

Malware Config

Signatures

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

Loads dropped DLL 1 IoCs

pid	Process
3980	001002998384756_pdf.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3980	001002998384756_pdf.exe
5088	001002998384756_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	001002998384756_pdf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	001002998384756_pdf.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{A0953C92-50DC-43bf-BE83-3742FED03C9C}\Instance\	001002998384756_pdf.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3980	001002998384756_pdf.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3980 wrote to memory of 7100	3980	001002998384756_pdf.exe	89
PID 3980 wrote to memory of 5088	3980	001002998384756_pdf.exe	90
PID 3980 wrote to memory of 5088	3980	001002998384756_pdf.exe	90
PID 5088 wrote to memory of 7160	5088	001002998384756_pdf.exe	92

C:\Users\Admin\AppData\Local\Temp\001002998384756_pdf.exe
"C:\Users\Admin\AppData\Local\Temp\001002998384756_pdf.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3980
- C:\Users\Admin\AppData\Local\Temp\001002998384756_pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\001002998384756_pdf.exe"
  2⤵
  PID:7100
- C:\Users\Admin\AppData\Local\Temp\001002998384756_pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\001002998384756_pdf.exe"
  2⤵
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5088
- - C:\Users\Admin\AppData\Local\Temp\001002998384756_pdf.exe
    "C:\Users\Admin\AppData\Local\Temp\001002998384756_pdf.exe"
    3⤵
    PID:7160

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

cyclotella.lnk

Path C:\Users\Admin\AppData\Local\Temp\cyclotella.lnk
Size 900B
SHA256 69d8dde38c0b0861d1625488b9d4259342aeec41ced369d304a4f3a8e4090ecb
MD5 761b15a30c837e87faab2b7fa1bb9271
SHA1 3bb1402137b1ad367c93997cc22e6e6db8bc66f7
SHA512 598f7e930f86725d1ff5c22da89c2f05e8bb344a3356875b542d465f94233e645bab427bb0b3a3cca21b066caf26ed438d2cfd295666a74b6abeb7004ec9982a
TLSH
T1A51146850A911B29D2F24B7642FA264AE6727C43FF680F494006814428A02D0F8B4F3F
MD5 SHA1 SHA512 TLSH

Submit Download

System.dll

Path C:\Users\Admin\AppData\Local\Temp\nsl69E.tmp\System.dll
Size 12KB
SHA256 23d618a0293c78ce00f7c6e6dd8b8923621da7dd1f63a070163ef4c0ec3033d6
MD5 192639861e3dc2dc5c08bb8f8c7260d5
SHA1 58d30e460609e22fa0098bc27d928b689ef9af78
SHA512 6e573d8b2ef6ed719e271fd0b2fd9cd451f61fc9a9459330108d6d7a65a0f64016303318cad787aa1d5334ba670d8f1c7c13074e1be550b4a316963ecc465cdc
SSDEEP 192:ljHcQ0qWTlt7wi5Aj/lM0sEWD/wtYbBjpNQybC7y+XZqE0QPi:R/Qlt7wiij/lMRv/9V4bfr
TLSH
T1B1427C1297B089F2F551493419667F2A6FBEAC5C13F405A3CFE304C63D212CB9839243
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3980-489-0x0000000006280000-0x00000000090DE000-memory.dmp

Download

memory/3980-490-0x00000000738A5000-0x00000000738A6000-memory.dmp

Download

memory/3980-492-0x0000000006280000-0x00000000090DE000-memory.dmp

Download

memory/5088-491-0x0000000001790000-0x00000000045EE000-memory.dmp

Download

memory/5088-493-0x00000000004A0000-0x0000000001786000-memory.dmp

Download

memory/5088-494-0x0000000001790000-0x00000000045EE000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads