guloader | cd28e2cfe01499fecd66cdc8ff88502194f77e826d6191c3f838c5f760402a8b

Analysis

max time kernel
148s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
20/05/2024, 21:08

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General

Target
fa10576.exe
Size 1.3MB
Sample240520-zzdrfagd64
SHA256 cd28e2cfe01499fecd66cdc8ff88502194f77e826d6191c3f838c5f760402a8b
MD5 b6fed6afcf62aeefa78ac29a132b73ea
SHA1 c596ab383a296dee20fb5d03af998d5c8ef6e61c
SHA512 07a7072a1e3bc7cb55d3103e5c7d0e77bc1e3d78ac33d964be7356d9b0eaa165d8cf9d38140e9e74dba7bb77b5f2fb3fd2ed8ec12a3a69813a868b0a326ca2e4
SSDEEP 24576:r9Q0lIVTRJlXeXeWAFlw3x1CQgy/U77VaaG8uosbrDqa1VHWTcSdmWDxbLn/ohm:5Q0lsRLXTCx1JM77YoOrDX1l2xbLn/wm
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

guloader downloader

Malware Config

Signatures

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

Loads dropped DLL 1 IoCs

pid	Process
4536	fa10576.exe

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

Web Service

T1102

flow	ioc
20	drive.google.com
21	drive.google.com

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2928	fa10576.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4536	fa10576.exe
2928	fa10576.exe

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 4536 set thread context of 2928	4536	fa10576.exe	93
PID 2928 set thread context of 3364	2928	fa10576.exe	56
PID 2928 set thread context of 4536	2928	fa10576.exe	104
PID 4536 set thread context of 3364	4536	runas.exe	56
PID 4536 set thread context of 2164	4536	runas.exe	112

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\konvoluterer\Forsikringsinspektrer.ini	fa10576.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\mycelian\sempitern.ini	fa10576.exe

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

System Information Discovery
T1082

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\Registry\User\S-1-5-21-2804150937-2146708401-419095071-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	runas.exe

Suspicious behavior: EnumeratesProcesses 46 IoCs

pid	Process
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
2928	fa10576.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe

Suspicious behavior: MapViewOfSection 8 IoCs

pid	Process
4536	fa10576.exe
2928	fa10576.exe
3364	Explorer.EXE
3364	Explorer.EXE
4536	runas.exe
4536	runas.exe
4536	runas.exe
4536	runas.exe

Suspicious use of UnmapMainImage 1 IoCs

pid	Process
3364	Explorer.EXE

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4536 wrote to memory of 2928	4536	fa10576.exe	93
PID 4536 wrote to memory of 2928	4536	fa10576.exe	93
PID 4536 wrote to memory of 2928	4536	fa10576.exe	93
PID 4536 wrote to memory of 2928	4536	fa10576.exe	93
PID 4536 wrote to memory of 2928	4536	fa10576.exe	93
PID 3364 wrote to memory of 4536	3364	Explorer.EXE	104
PID 3364 wrote to memory of 4536	3364	Explorer.EXE	104
PID 3364 wrote to memory of 4536	3364	Explorer.EXE	104
PID 4536 wrote to memory of 2164	4536	runas.exe	112
PID 4536 wrote to memory of 2164	4536	runas.exe	112

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious behavior: MapViewOfSection
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:3364
- C:\Users\Admin\AppData\Local\Temp\fa10576.exe
  "C:\Users\Admin\AppData\Local\Temp\fa10576.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - Drops file in Program Files directory
  - Drops file in Windows directory
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:4536
- - C:\Users\Admin\AppData\Local\Temp\fa10576.exe
    "C:\Users\Admin\AppData\Local\Temp\fa10576.exe"
    3⤵
    - Suspicious use of NtCreateThreadExHideFromDebugger
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    PID:2928
- C:\Windows\SysWOW64\runas.exe
  "C:\Windows\SysWOW64\runas.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Modifies Internet Explorer settings
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:4536
- - C:\Program Files\Mozilla Firefox\Firefox.exe
    "C:\Program Files\Mozilla Firefox\Firefox.exe"
    3⤵
    PID:2164

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

System.dll

Path C:\Users\Admin\AppData\Local\Temp\nsb4AF5.tmp\System.dll
Size 11KB
SHA256 98bcd1dd88642f4dd36a300c76ebb1ddfbbbc5bfc7e3b6d7435dc6d6e030c13b
MD5 b8992e497d57001ddf100f9c397fcef5
SHA1 e26ddf101a2ec5027975d2909306457c6f61cfbd
SHA512 8823b1904dccfaf031068102cb1def7958a057f49ff369f0e061f1b4db2090021aa620bb8442a2a6ac9355bb74ee54371dc2599c20dc723755a46ede81533a3c
SSDEEP 192:PPtkumJX7zB22kGwfy0mtVgkCPOs81un:E702k5qpds8Qn
MD5 SHA1 SHA512 SSDEEP

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memory/2164-69-0x000001E320890000-0x000001E320972000-memory.dmp

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memory/2928-51-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/2928-54-0x0000000001660000-0x0000000003D56000-memory.dmp

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memory/2928-35-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/2928-36-0x0000000001660000-0x0000000003D56000-memory.dmp

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memory/2928-60-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/2928-50-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/2928-59-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/2928-55-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/2928-53-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/3364-62-0x00000000086C0000-0x000000000876B000-memory.dmp

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memory/4536-34-0x0000000010004000-0x0000000010005000-memory.dmp

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memory/4536-52-0x0000000004B40000-0x0000000007236000-memory.dmp

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memory/4536-58-0x0000000000600000-0x000000000063F000-memory.dmp

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memory/4536-33-0x0000000077471000-0x0000000077591000-memory.dmp

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memory/4536-37-0x0000000004B40000-0x0000000007236000-memory.dmp

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memory/4536-61-0x0000000000600000-0x000000000063F000-memory.dmp

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memory/4536-32-0x0000000004B40000-0x0000000007236000-memory.dmp

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