guloader | b3cc4e1f09aa77a31e7071f2a505bfe5f13f9ec3cb73997b0d4a5ac36fc710fa

Analysis

max time kernel
93s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
24-12-2024 14:12

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

BMS PO 4820.exe
Size

124KB
MD5

1a935bd1a54484f0e02172f00a05d223
SHA1

0845159084e5ff0bfcd1459686cbde277a56d3c2
SHA256

ba9453ec62ef440d13e1e0e7bcd7fc391a5bfd80fd0db7350bd5824d41385757
SHA512

eb38e3e6909aadce68d47c9859da83bb0b2b2668baeaaa9d29223007f08de37cdd192101e1b883d1682b48d44b930cd2205776a670f41cd8627503f6db3261a1
SSDEEP

1536:4bR9CTg/c9iG0LL7Le5KaWbR9CTg/c9iG0L:427YVDmW27YV

Score

10^/10

guloader discovery downloader guloader

Malware Config

Extracted

Family

guloader

https://drive.google.com/uc?export=download&id=1qCk1c-sywYiSOatB4J7OY2cPPHJ88OmZ

Signatures

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

Guloader payload 2 IoCs

guloader

resource	yara_rule
behavioral26/memory/968-2-0x0000000002A30000-0x0000000002A3B000-memory.dmp	family_guloader
behavioral26/memory/2316-4-0x0000000001020000-0x0000000001120000-memory.dmp	family_guloader

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
13	drive.google.com
14	drive.google.com

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
968	BMS PO 4820.exe
2316	RegAsm.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 968 set thread context of 2316	968	BMS PO 4820.exe	81

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	BMS PO 4820.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
968	BMS PO 4820.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
968	BMS PO 4820.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 968 wrote to memory of 2316	968	BMS PO 4820.exe	81
PID 968 wrote to memory of 2316	968	BMS PO 4820.exe	81
PID 968 wrote to memory of 2316	968	BMS PO 4820.exe	81
PID 968 wrote to memory of 2316	968	BMS PO 4820.exe	81

C:\Users\Admin\AppData\Local\Temp\BMS PO 4820.exe
"C:\Users\Admin\AppData\Local\Temp\BMS PO 4820.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:968
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
  "C:\Users\Admin\AppData\Local\Temp\BMS PO 4820.exe"
  2⤵
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  PID:2316

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

Web Service

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/968-2-0x0000000002A30000-0x0000000002A3B000-memory.dmp

Filesize
44KB

Download
memory/968-3-0x0000000077411000-0x0000000077531000-memory.dmp

Filesize
1.1MB

Download
memory/968-15-0x0000000002A30000-0x0000000002A3B000-memory.dmp

Filesize
44KB

Download
memory/968-16-0x0000000002A30000-0x0000000002A3B000-memory.dmp

Filesize
44KB

Download
memory/2316-4-0x0000000001020000-0x0000000001120000-memory.dmp

Filesize
1024KB

Download
memory/2316-5-0x0000000077411000-0x0000000077531000-memory.dmp

Filesize
1.1MB

Download