guloader | 5ebca5243dc4cf0c123c002d7988122752fa9f30d8307088c2032eb73c5797d4

General

Target

IMAGE009.exe
Size

48KB
MD5

6745d672f7cb5ff1f30f03102d04d93d
SHA1

d43b4ac514e028149eefe12dde3ac6d735d73c90
SHA256

98532369bf15476ed0d391e66d46a010ce3aa600b9f3984537a9bd2273979dae
SHA512

af7a963edf527c4c887cf638e871e8ad3a721956ee0fcc9add2a13d276dc742fec75c19c46f08401a750c2bb28f5f136f02a0fe9afaab1e435a373208c105f5b
SSDEEP

384:elA3NH/TlAywJ1RmLBs4RbV7wMwEABlayQo2HTdEUHUnghlmpO9b/Dj:elA9H/+J1RmBbnl4abfHV0gfvb7

Score

10^/10

guloader downloader persistence

Malware Config

Extracted

Family

guloader

C2

https://drive.google.com/uc?export=download&id=1Tl1mezjGINJn1ze2zId2a857tI3X496H

xor.base64

Signatures

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

Executes dropped EXE 1 IoCs

pid	Process
4572	Allocator.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	IMAGE009.exe

Loads dropped DLL 1 IoCs

pid	Process
1644	Allocator.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	IMAGE009.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Sommergst7 = "C:\\Users\\Admin\\Regress\\Allocator.vbs"	IMAGE009.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	Allocator.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Sommergst7 = "C:\\Users\\Admin\\Regress\\Allocator.vbs"	Allocator.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Suspicious use of NtSetInformationThreadHideFromDebugger 4 IoCs

pid	Process
3348	IMAGE009.exe
4864	IMAGE009.exe
4572	Allocator.exe
1644	Allocator.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3348 set thread context of 4864	3348	IMAGE009.exe	80
PID 4572 set thread context of 1644	4572	Allocator.exe	82

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
3348	IMAGE009.exe
4572	Allocator.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3348	IMAGE009.exe
4572	Allocator.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 3348 wrote to memory of 4864	3348	IMAGE009.exe	80
PID 3348 wrote to memory of 4864	3348	IMAGE009.exe	80
PID 3348 wrote to memory of 4864	3348	IMAGE009.exe	80
PID 3348 wrote to memory of 4864	3348	IMAGE009.exe	80
PID 4864 wrote to memory of 4572	4864	IMAGE009.exe	81
PID 4864 wrote to memory of 4572	4864	IMAGE009.exe	81
PID 4864 wrote to memory of 4572	4864	IMAGE009.exe	81
PID 4572 wrote to memory of 1644	4572	Allocator.exe	82
PID 4572 wrote to memory of 1644	4572	Allocator.exe	82
PID 4572 wrote to memory of 1644	4572	Allocator.exe	82
PID 4572 wrote to memory of 1644	4572	Allocator.exe	82

C:\Users\Admin\AppData\Local\Temp\IMAGE009.exe
"C:\Users\Admin\AppData\Local\Temp\IMAGE009.exe"
1⤵
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3348
- C:\Users\Admin\AppData\Local\Temp\IMAGE009.exe
  "C:\Users\Admin\AppData\Local\Temp\IMAGE009.exe"
  2⤵
  - Checks computer location settings
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of WriteProcessMemory
  PID:4864
- - C:\Users\Admin\Regress\Allocator.exe
    "C:\Users\Admin\Regress\Allocator.exe"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious use of SetThreadContext
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4572
  - - C:\Users\Admin\Regress\Allocator.exe
      "C:\Users\Admin\Regress\Allocator.exe"
      4⤵
      Loads dropped DLL
      Suspicious use of NtSetInformationThreadHideFromDebugger
      PID:1644

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

Web Service

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\Regress\Allocator.exe

Filesize
48KB

MD5
6745d672f7cb5ff1f30f03102d04d93d

SHA1
d43b4ac514e028149eefe12dde3ac6d735d73c90

SHA256
98532369bf15476ed0d391e66d46a010ce3aa600b9f3984537a9bd2273979dae

SHA512
af7a963edf527c4c887cf638e871e8ad3a721956ee0fcc9add2a13d276dc742fec75c19c46f08401a750c2bb28f5f136f02a0fe9afaab1e435a373208c105f5b

Download Submit
C:\Users\Admin\Regress\Allocator.exe

Filesize
48KB

MD5
6745d672f7cb5ff1f30f03102d04d93d

SHA1
d43b4ac514e028149eefe12dde3ac6d735d73c90

SHA256
98532369bf15476ed0d391e66d46a010ce3aa600b9f3984537a9bd2273979dae

SHA512
af7a963edf527c4c887cf638e871e8ad3a721956ee0fcc9add2a13d276dc742fec75c19c46f08401a750c2bb28f5f136f02a0fe9afaab1e435a373208c105f5b

Download Submit
C:\Users\Admin\Regress\Allocator.exe

Filesize
48KB

MD5
6745d672f7cb5ff1f30f03102d04d93d

SHA1
d43b4ac514e028149eefe12dde3ac6d735d73c90

SHA256
98532369bf15476ed0d391e66d46a010ce3aa600b9f3984537a9bd2273979dae

SHA512
af7a963edf527c4c887cf638e871e8ad3a721956ee0fcc9add2a13d276dc742fec75c19c46f08401a750c2bb28f5f136f02a0fe9afaab1e435a373208c105f5b

Download Submit
memory/1644-161-0x0000000000560000-0x0000000000660000-memory.dmp

Filesize
1024KB

Download
memory/1644-165-0x0000000077730000-0x00000000778D3000-memory.dmp

Filesize
1.6MB

Download
memory/1644-164-0x00007FFCE2BF0000-0x00007FFCE2DE5000-memory.dmp

Filesize
2.0MB

Download
memory/1644-163-0x0000000077730000-0x00000000778D3000-memory.dmp

Filesize
1.6MB

Download
memory/1644-162-0x00007FFCE2BF0000-0x00007FFCE2DE5000-memory.dmp

Filesize
2.0MB

Download
memory/3348-138-0x00000000021F0000-0x00000000021F8000-memory.dmp

Filesize
32KB

Download
memory/3348-140-0x0000000077730000-0x00000000778D3000-memory.dmp

Filesize
1.6MB

Download
memory/3348-141-0x00007FFCE2BF0000-0x00007FFCE2DE5000-memory.dmp

Filesize
2.0MB

Download
memory/3348-139-0x00007FFCE2BF0000-0x00007FFCE2DE5000-memory.dmp

Filesize
2.0MB

Download
memory/4572-156-0x0000000001FA0000-0x0000000001FA8000-memory.dmp

Filesize
32KB

Download
memory/4572-159-0x00007FFCE2BF0000-0x00007FFCE2DE5000-memory.dmp

Filesize
2.0MB

Download
memory/4572-160-0x0000000077730000-0x00000000778D3000-memory.dmp

Filesize
1.6MB

Download
memory/4864-149-0x00007FFCE2BF0000-0x00007FFCE2DE5000-memory.dmp

Filesize
2.0MB

Download
memory/4864-152-0x0000000077730000-0x00000000778D3000-memory.dmp

Filesize
1.6MB

Download
memory/4864-148-0x0000000000560000-0x0000000000660000-memory.dmp

Filesize
1024KB

Download
memory/4864-144-0x0000000077730000-0x00000000778D3000-memory.dmp

Filesize
1.6MB

Download
memory/4864-143-0x0000000077730000-0x00000000778D3000-memory.dmp

Filesize
1.6MB

Download
memory/4864-142-0x00007FFCE2BF0000-0x00007FFCE2DE5000-memory.dmp

Filesize
2.0MB

Download
memory/4864-137-0x0000000000401000-0x0000000000506000-memory.dmp

Filesize
1.0MB

Download
memory/4864-135-0x0000000000400000-0x000000000055D000-memory.dmp

Filesize
1.4MB

Download

Analysis

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