guloader | c0518a5a62f316bc4596f1270f9e8fd07fec9204266e4657e7c7c6d93613f801

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
27/03/2025, 01:10

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General

Target

KONTRAKT-pdf.exe
Size

831KB
MD5

b0c7ab10be42ea7a840c7f51b1c95f81
SHA1

532dd15c1086b8d2af0ee678797282742385558e
SHA256

e9887c4fd1a66a2c7efaf6c7cb52765b4368a8cbb225df248f2fddc6d20f378b
SHA512

475a90ccbc57d0ae08f9a1a19a6a0a9c13175712512eaa2895b905feeced64446f74951afd1760d61c0e62d82d8b056b5e95532ea49395c72a14bc729187f072
SSDEEP

24576:mdYBcYrRLg2AYpsmF0tlrluJzu5IOImYGyFGAUoTJTvuhyR:mqcYrRLgEUlrAyaO7dyFGAHFvsyR

Score

10^/10

guloader discovery downloader

Malware Config

Signatures

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

Loads dropped DLL 1 IoCs

pid	Process
2052	KONTRAKT-pdf.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2052	KONTRAKT-pdf.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3048	2788	WerFault.exe	31

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	KONTRAKT-pdf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	KONTRAKT-pdf.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2052	KONTRAKT-pdf.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2052 wrote to memory of 2788	2052	KONTRAKT-pdf.exe	31
PID 2052 wrote to memory of 2788	2052	KONTRAKT-pdf.exe	31
PID 2052 wrote to memory of 2788	2052	KONTRAKT-pdf.exe	31
PID 2052 wrote to memory of 2788	2052	KONTRAKT-pdf.exe	31
PID 2052 wrote to memory of 2788	2052	KONTRAKT-pdf.exe	31
PID 2788 wrote to memory of 3048	2788	KONTRAKT-pdf.exe	32
PID 2788 wrote to memory of 3048	2788	KONTRAKT-pdf.exe	32
PID 2788 wrote to memory of 3048	2788	KONTRAKT-pdf.exe	32
PID 2788 wrote to memory of 3048	2788	KONTRAKT-pdf.exe	32

C:\Users\Admin\AppData\Local\Temp\KONTRAKT-pdf.exe
"C:\Users\Admin\AppData\Local\Temp\KONTRAKT-pdf.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2052
- C:\Users\Admin\AppData\Local\Temp\KONTRAKT-pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\KONTRAKT-pdf.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2788
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2788 -s 104
    3⤵
    - Program crash
    PID:3048

Network

MITRE ATT&CK Enterprise v15

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

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\nso4B64.tmp\System.dll

Filesize
11KB

MD5
9625d5b1754bc4ff29281d415d27a0fd

SHA1
80e85afc5cccd4c0a3775edbb90595a1a59f5ce0

SHA256
c2f405d7402f815d0c3fadd9a50f0bbbb1bab9aa38fe347823478a2587299448

SHA512
dce52b640897c2e8dbfd0a1472d5377fa91fb9cf1aeff62604d014bccbe5b56af1378f173132abeb0edd18c225b9f8f5e3d3e72434aed946661e036c779f165b

Download Submit
memory/2052-27-0x0000000077220000-0x00000000773C9000-memory.dmp

Filesize
1.7MB

Download
memory/2052-26-0x0000000077221000-0x0000000077322000-memory.dmp

Filesize
1.0MB

Download
memory/2788-29-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2788-28-0x0000000001470000-0x00000000049D1000-memory.dmp

Filesize
53.4MB

Download
memory/2788-31-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download