guloader | 8085c17ea9441ff19ee1d021408ce2b159bdf4d53704a9afd180e76033c74415

Analysis

max time kernel
123s
max time network
130s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
30/10/2024, 00:07

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General

Target
rTransferenciarealizada451236.exe
Size 893KB
Sample241030-aeqststner
SHA256 8085c17ea9441ff19ee1d021408ce2b159bdf4d53704a9afd180e76033c74415
MD5 12f32dc32a25a48db3aca40758745e80
SHA1 41f2c89b8c83b279633c641d1e266a3a2487294d
SHA512 b3e71933c26fc75dfa3aef0efc9ef375572df28cdba1b85dac9ecda062e572a6999dcbeec382b04e5a7d24e3485f5aa6852fad9e2d36fded55525fa8acf8dd9c
SSDEEP 24576:6x+rRnZt2HrJ1oAzm2ESD62HnQIQMOKOaeKX:6x+1nZcLHFzmnSW2HTzOKOwX
MD5 SHA1 SHA512 SSDEEP

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
2596	rTransferenciarealizada451236.exe
2596	rTransferenciarealizada451236.exe

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

Web Service

T1102

flow	ioc
3	drive.google.com
5	drive.google.com

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
1692	rTransferenciarealizada451236.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2596	rTransferenciarealizada451236.exe
1692	rTransferenciarealizada451236.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2596 set thread context of 1692	2596	rTransferenciarealizada451236.exe	29

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\Reoil.mul	rTransferenciarealizada451236.exe

Drops file in Windows directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\stenhjsplanternes\fordreves.ini	rTransferenciarealizada451236.exe
File opened for modification	C:\Windows\Fonts\karrooers.ini	rTransferenciarealizada451236.exe
File opened for modification	C:\Windows\Fonts\brunsttiderne.tri	rTransferenciarealizada451236.exe
File opened for modification	C:\Windows\Fonts\Spodium39.int	rTransferenciarealizada451236.exe
File opened for modification	C:\Windows\Belringernes\Dermatophony.ini	rTransferenciarealizada451236.exe
File opened for modification	C:\Windows\resources\nringsmiddelet.ini	rTransferenciarealizada451236.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
1932	1692	WerFault.exe	29

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	rTransferenciarealizada451236.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rTransferenciarealizada451236.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1692	rTransferenciarealizada451236.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2596	rTransferenciarealizada451236.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2596 wrote to memory of 1692	2596	rTransferenciarealizada451236.exe	29
PID 2596 wrote to memory of 1692	2596	rTransferenciarealizada451236.exe	29
PID 2596 wrote to memory of 1692	2596	rTransferenciarealizada451236.exe	29
PID 2596 wrote to memory of 1692	2596	rTransferenciarealizada451236.exe	29
PID 2596 wrote to memory of 1692	2596	rTransferenciarealizada451236.exe	29
PID 2596 wrote to memory of 1692	2596	rTransferenciarealizada451236.exe	29
PID 1692 wrote to memory of 1932	1692	rTransferenciarealizada451236.exe	31
PID 1692 wrote to memory of 1932	1692	rTransferenciarealizada451236.exe	31
PID 1692 wrote to memory of 1932	1692	rTransferenciarealizada451236.exe	31
PID 1692 wrote to memory of 1932	1692	rTransferenciarealizada451236.exe	31

C:\Users\Admin\AppData\Local\Temp\rTransferenciarealizada451236.exe
"C:\Users\Admin\AppData\Local\Temp\rTransferenciarealizada451236.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2596
- C:\Users\Admin\AppData\Local\Temp\rTransferenciarealizada451236.exe
  "C:\Users\Admin\AppData\Local\Temp\rTransferenciarealizada451236.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1692
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1692 -s 68
    3⤵
    - Program crash
    PID:1932

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

Web Service

T1102

Exfiltration

Impact

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Downloads

System.dll

Path \Users\Admin\AppData\Local\Temp\nszEE56.tmp\System.dll
Size 11KB
SHA256 b80a5cba69d1853ed5979b0ca0352437bf368a5cfb86cb4528edadd410e11352
MD5 c9473cb90d79a374b2ba6040ca16e45c
SHA1 ab95b54f12796dce57210d65f05124a6ed81234a
SHA512 eafe7d5894622bc21f663bca4dd594392ee0f5b29270b6b56b0187093d6a3a103545464ff6398ad32d2cf15dab79b1f133218ba9ba337ddc01330b5ada804d7b
SSDEEP 192:cPtkumJX7zBE2kGwfy9S9VkPsFQ1MZ1c:N7O2k5q9wA1MZa
MD5 SHA1 SHA512 SSDEEP

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memory/1692-49-0x0000000000400000-0x0000000001462000-memory.dmp

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memory/1692-26-0x00000000772F0000-0x0000000077499000-memory.dmp

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memory/1692-24-0x0000000000400000-0x0000000001462000-memory.dmp

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memory/1692-48-0x0000000000400000-0x0000000001462000-memory.dmp

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memory/1692-50-0x0000000000400000-0x0000000001462000-memory.dmp

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memory/1692-52-0x0000000000400000-0x0000000001462000-memory.dmp

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memory/1692-51-0x0000000000400000-0x0000000001462000-memory.dmp

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memory/1692-53-0x0000000000400000-0x0000000001462000-memory.dmp

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memory/2596-21-0x0000000002C80000-0x0000000004D83000-memory.dmp

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memory/2596-23-0x00000000772F0000-0x0000000077499000-memory.dmp

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memory/2596-22-0x00000000772F1000-0x00000000773F2000-memory.dmp

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memory/2596-25-0x0000000002C80000-0x0000000004D83000-memory.dmp

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memory/2596-20-0x0000000002C80000-0x0000000004D83000-memory.dmp

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