guloader | 154b351316b313b40bb9a95675e069b13472e30b8aa96f02c2dbf16cb0ca099c

General

Target

Forreste.exe
Size

895KB
MD5

b6bcb5405a50ef97d57ae2b43ad5d01e
SHA1

2c8288be420bdb1b53438f07cbcdec259f47bd0d
SHA256

0c3b34493099cbbfbf51b25a4befe93e8d1b92008884500f91c66e2bd00dee1f
SHA512

1a0eeea2ce4608fc4e0ae67b94f6c137de873b5c0da735c22a2e295dd9577aa1f6ba85ecd0193d771289d417a1d9cc758ea5cf8284cf3f2e3272571414cc9391
SSDEEP

24576:5x+rg0PyXjILtPkoAzuyn/pBF62HnQIQMOKOaeKg:5x+s0PyXjIxPkFzucp22HTzOKOwg

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
1172	Forreste.exe
1172	Forreste.exe

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

Web Service

T1102

flow	ioc
3	drive.google.com
4	drive.google.com

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2044	Forreste.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1172	Forreste.exe
2044	Forreste.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1172 set thread context of 2044	1172	Forreste.exe	30

Drops file in Program Files directory 1 IoCs

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

Drops file in Windows directory 6 IoCs

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

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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Forreste.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Forreste.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
2044	Forreste.exe
2044	Forreste.exe
2044	Forreste.exe
2044	Forreste.exe
2044	Forreste.exe
2044	Forreste.exe
2044	Forreste.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1172	Forreste.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1172 wrote to memory of 2044	1172	Forreste.exe	30
PID 1172 wrote to memory of 2044	1172	Forreste.exe	30
PID 1172 wrote to memory of 2044	1172	Forreste.exe	30
PID 1172 wrote to memory of 2044	1172	Forreste.exe	30
PID 1172 wrote to memory of 2044	1172	Forreste.exe	30
PID 1172 wrote to memory of 2044	1172	Forreste.exe	30

C:\Users\Admin\AppData\Local\Temp\Forreste.exe
"C:\Users\Admin\AppData\Local\Temp\Forreste.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:1172
- C:\Users\Admin\AppData\Local\Temp\Forreste.exe
  "C:\Users\Admin\AppData\Local\Temp\Forreste.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:2044

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\nst82A8.tmp\System.dll

Filesize
11KB

MD5
c9473cb90d79a374b2ba6040ca16e45c

SHA1
ab95b54f12796dce57210d65f05124a6ed81234a

SHA256
b80a5cba69d1853ed5979b0ca0352437bf368a5cfb86cb4528edadd410e11352

SHA512
eafe7d5894622bc21f663bca4dd594392ee0f5b29270b6b56b0187093d6a3a103545464ff6398ad32d2cf15dab79b1f133218ba9ba337ddc01330b5ada804d7b

Download Submit
memory/1172-20-0x0000000003640000-0x00000000063C8000-memory.dmp

Filesize
45.5MB

Download
memory/1172-21-0x0000000003640000-0x00000000063C8000-memory.dmp

Filesize
45.5MB

Download
memory/1172-22-0x00000000770C0000-0x0000000077196000-memory.dmp

Filesize
856KB

Download
memory/1172-23-0x0000000076ED1000-0x0000000076FD2000-memory.dmp

Filesize
1.0MB

Download
memory/1172-24-0x0000000076ED0000-0x0000000077079000-memory.dmp

Filesize
1.7MB

Download
memory/1172-25-0x0000000003640000-0x00000000063C8000-memory.dmp

Filesize
45.5MB

Download
memory/2044-26-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2044-27-0x0000000076ED0000-0x0000000077079000-memory.dmp

Filesize
1.7MB

Download
memory/2044-49-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2044-50-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2044-51-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2044-52-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2044-53-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2044-54-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2044-60-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download

Analysis

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