guloader | 20625a1893d5aff3afa4cdfe0afb56926e45a264f7bc3d5759f69fa0d16798fa

Analysis

max time kernel
148s
max time network
153s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
03-11-2024 19:53

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General

Target

Spec_Tender_3003_850-07-November-2024_PDF.exe
Size

851KB
MD5

629be165860d2336755de85467756639
SHA1

af1da57d01a00bf942e127cce60fb4208bfd9795
SHA256

e9617a78c93e6d5cdc1087dfa6e9bf9d63406e05b6b01135c189242a7c33718c
SHA512

418f56a804212158033b1ae592cafeb8fa1c5a0d9506eb541beb7762c23ebfe5c61dbac8588c350816c229e9f6d77457e361423146874695976c1b8d9267cbff
SSDEEP

24576:ZNAsPMh+Cdd8509puHmATonQ1htKzWbGWO:dPMvA509pkonAhtHbnO

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

Processes:

Spec_Tender_3003_850-07-November-2024_PDF.exe

pid	Process
2236	Spec_Tender_3003_850-07-November-2024_PDF.exe
2236	Spec_Tender_3003_850-07-November-2024_PDF.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

Spec_Tender_3003_850-07-November-2024_PDF.exeSpec_Tender_3003_850-07-November-2024_PDF.exe

pid	Process
2236	Spec_Tender_3003_850-07-November-2024_PDF.exe
2920	Spec_Tender_3003_850-07-November-2024_PDF.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

Spec_Tender_3003_850-07-November-2024_PDF.exe

description	pid	Process	procid_target
PID 2236 set thread context of 2920	2236	Spec_Tender_3003_850-07-November-2024_PDF.exe	29

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

Processes:

Spec_Tender_3003_850-07-November-2024_PDF.exeSpec_Tender_3003_850-07-November-2024_PDF.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Spec_Tender_3003_850-07-November-2024_PDF.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Spec_Tender_3003_850-07-November-2024_PDF.exe

Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

Spec_Tender_3003_850-07-November-2024_PDF.exe

pid	Process
2236	Spec_Tender_3003_850-07-November-2024_PDF.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Spec_Tender_3003_850-07-November-2024_PDF.exe

description	pid	Process	procid_target
PID 2236 wrote to memory of 2920	2236	Spec_Tender_3003_850-07-November-2024_PDF.exe	29
PID 2236 wrote to memory of 2920	2236	Spec_Tender_3003_850-07-November-2024_PDF.exe	29
PID 2236 wrote to memory of 2920	2236	Spec_Tender_3003_850-07-November-2024_PDF.exe	29
PID 2236 wrote to memory of 2920	2236	Spec_Tender_3003_850-07-November-2024_PDF.exe	29
PID 2236 wrote to memory of 2920	2236	Spec_Tender_3003_850-07-November-2024_PDF.exe	29
PID 2236 wrote to memory of 2920	2236	Spec_Tender_3003_850-07-November-2024_PDF.exe	29

C:\Users\Admin\AppData\Local\Temp\Spec_Tender_3003_850-07-November-2024_PDF.exe
"C:\Users\Admin\AppData\Local\Temp\Spec_Tender_3003_850-07-November-2024_PDF.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2236
- C:\Users\Admin\AppData\Local\Temp\Spec_Tender_3003_850-07-November-2024_PDF.exe
  "C:\Users\Admin\AppData\Local\Temp\Spec_Tender_3003_850-07-November-2024_PDF.exe"
  2⤵
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  PID:2920

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

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Downloads

\Users\Admin\AppData\Local\Temp\nszCA62.tmp\System.dll

Filesize
11KB

MD5
be2621a78a13a56cf09e00dd98488360

SHA1
75f0539dc6af200a07cdb056cddddec595c6cfd2

SHA256
852047023ba0cae91c7a43365878613cfb4e64e36ff98c460e113d5088d68ef5

SHA512
b80cf1f678e6885276b9a1bfd9227374b2eb9e38bb20446d52ebe2c3dba89764aa50cb4d49df51a974478f3364b5dbcbc5b4a16dc8f1123b40c89c01725be3d1

Download Submit
memory/2236-31-0x0000000003060000-0x0000000004605000-memory.dmp

Filesize
21.6MB

Download
memory/2236-32-0x0000000003060000-0x0000000004605000-memory.dmp

Filesize
21.6MB

Download
memory/2236-33-0x0000000077C91000-0x0000000077D92000-memory.dmp

Filesize
1.0MB

Download
memory/2236-34-0x0000000077C90000-0x0000000077E39000-memory.dmp

Filesize
1.7MB

Download
memory/2236-36-0x0000000003060000-0x0000000004605000-memory.dmp

Filesize
21.6MB

Download
memory/2920-37-0x0000000077C90000-0x0000000077E39000-memory.dmp

Filesize
1.7MB

Download
memory/2920-35-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2920-38-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2920-40-0x0000000077C90000-0x0000000077E39000-memory.dmp

Filesize
1.7MB

Download