guloader | a531f76cd54f5f1d0e1628e1524d92f6888ef7fc5be65646b2dc2ba6ddd22251

Analysis

max time kernel
149s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
28/09/2024, 08:16

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General

Target

FedEx - pdf.exe
Size

44KB
MD5

aa890fe58f0213d807f5cfe5225ce6f6
SHA1

e1801b3fef0108f6ed52bc208ced3172f055f554
SHA256

d903f13829898df4cbc159665a0772cb66b0c78dcbd0edc2bfc2cd3e1c1cbca7
SHA512

3cecb519b1b7cfac61f82f63feb15b74be4c1495897313203c2fea845f47eccfc13dde89cca7f43fcdaa0a6a661e17fd621f0670e3237969085cfa2b29c05e99
SSDEEP

384:uliF/weWx/018HKdNgQcTpSHr53y0r/TQSkNsnNjBGZDj5W+nHil7kHQFcCkcKmp:/4eWxw8oZc83y0zKsnx0ipINcxTv/

Score

10^/10

guloader discovery downloader

Malware Config

Extracted

Family

guloader

http://castmart.ga/~zadmin/icloud/chs_encrypted_CE5E8CF.bin

xor.base64

Signatures

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

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2124	FedEx - pdf.exe
4708	FedEx - pdf.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2124 set thread context of 4708	2124	FedEx - pdf.exe	89

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

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2124	FedEx - pdf.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2124	FedEx - pdf.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2124 wrote to memory of 4708	2124	FedEx - pdf.exe	89
PID 2124 wrote to memory of 4708	2124	FedEx - pdf.exe	89
PID 2124 wrote to memory of 4708	2124	FedEx - pdf.exe	89
PID 2124 wrote to memory of 4708	2124	FedEx - pdf.exe	89

C:\Users\Admin\AppData\Local\Temp\FedEx - pdf.exe
"C:\Users\Admin\AppData\Local\Temp\FedEx - pdf.exe"
1⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2124
- C:\Users\Admin\AppData\Local\Temp\FedEx - pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\FedEx - pdf.exe"
  2⤵
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  PID:4708

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4380,i,11251706013556949551,5157034131170452377,262144 --variations-seed-version --mojo-platform-channel-handle=4188 /prefetch:8
1⤵
PID:3300

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2124-2-0x0000000002230000-0x0000000002237000-memory.dmp

Filesize
28KB

Download
memory/2124-3-0x0000000077DD1000-0x0000000077EF1000-memory.dmp

Filesize
1.1MB

Download
memory/2124-5-0x0000000002230000-0x0000000002237000-memory.dmp

Filesize
28KB

Download
memory/4708-4-0x0000000000400000-0x00000000004E7000-memory.dmp

Filesize
924KB

Download
memory/4708-7-0x00000000004F0000-0x00000000005F0000-memory.dmp

Filesize
1024KB

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