guloader | 2b1477f3067516017f5342a31030e8a200870885137802bc8447c009eabfec96

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
29-12-2024 08:34

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General

Target

receipt_001546037_pdf.exe
Size

170KB
MD5

d5aa2c1bde54eed4dea0a726f53ece83
SHA1

f65cbee27265f644d9689616ac6bcfec57bbb9d1
SHA256

18f08ae0c963df4cdb63a1f5c9f772bacc4c55b10cb64aed51963071999961a3
SHA512

393cb8b044d177ebd3b8bfc1999268265c4593cd3559118860154298b988ab4a25b9e39a0624314ba1933a15602bb5dc3817913d8b30fe388a4a3d482acc7ade
SSDEEP

3072:5/c/d6j3AaTzfYbX/8pFDu8EYPLMqM9VO7jdKexAnZTJKjwThQFMFF7tsnm2kZfd:5/c/43A4SvktHLq9VYFxAnZuwO2FFOd6

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 2 IoCs

pid	Process
1732	receipt_001546037_pdf.exe
1732	receipt_001546037_pdf.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\Vekselerfirmaer\Triangulationernes\Packaging.ini	receipt_001546037_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
2256	1732	WerFault.exe	29

System Location Discovery: System Language Discovery 1 TTPs 1 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	receipt_001546037_pdf.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1732 wrote to memory of 2256	1732	receipt_001546037_pdf.exe	31
PID 1732 wrote to memory of 2256	1732	receipt_001546037_pdf.exe	31
PID 1732 wrote to memory of 2256	1732	receipt_001546037_pdf.exe	31
PID 1732 wrote to memory of 2256	1732	receipt_001546037_pdf.exe	31

C:\Users\Admin\AppData\Local\Temp\receipt_001546037_pdf.exe
"C:\Users\Admin\AppData\Local\Temp\receipt_001546037_pdf.exe"
1⤵
- Loads dropped DLL
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1732
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1732 -s 540
  2⤵
  - Program crash
  PID:2256

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

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\nsdA5B3.tmp\System.dll

Filesize
12KB

MD5
637e1fa13012a78922b6e98efc0b12e2

SHA1
8012d44e42cd6d813ea63d5ccbf190fe72e3c778

SHA256
703e17d30a91775f8ddc2648b537fc846fad6415589a503a4529c36f60a17439

SHA512
932ed6a52e89c4fa587a7c0c3903d69cf89a32dbd46ed8dcb251abb6c15192d92b1f624c31f0e4bd3e9bf95fc1a55fdb7cee9dd668e1b4f22ddb95786c063e96

Download Submit
memory/1732-13-0x0000000003D50000-0x0000000003E51000-memory.dmp

Filesize
1.0MB

Download
memory/1732-14-0x0000000003D50000-0x0000000003E51000-memory.dmp

Filesize
1.0MB

Download
memory/1732-15-0x0000000003D50000-0x0000000003E51000-memory.dmp

Filesize
1.0MB

Download