guloader | 8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe

General

Target

8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe
Size

750KB
MD5

5c64ce5f7c6b88767f77b788a4fb5b19
SHA1

05cf5307feb87910eef79cec65ee8ab1613e28a9
SHA256

8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe
SHA512

25caeddc9d0c42b0ab1d7f6d81303c3b44be9adb3ce5e1ac49f3c78b5cd98c6f05ff07c49c0b79b2d140cb520a0f7bfbf1a7ffe549018417dd1ac44e25c0e045
SSDEEP

12288:AuO/1lVnS6t0bXm0Uf+2Pvmj8vZ8piCM3dj3DcLIPDgMlXZo+LLhz78q6TMmC93V:Q/1lYFLmVft2j15MNj3wLsA+f54qQMmM

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
1204	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe
1204	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
5028	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1204	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe
5028	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1204 set thread context of 5028	1204	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe	88

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\resources\synderegistres.lnk	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe
File opened for modification	C:\Windows\resources\synderegistres.lnk	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe
File opened for modification	C:\Windows\negotiate\Anstdeligheden.ini	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.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
2320	5028	WerFault.exe	88

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	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
5028	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe
5028	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1204	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1204 wrote to memory of 5028	1204	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe	88
PID 1204 wrote to memory of 5028	1204	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe	88
PID 1204 wrote to memory of 5028	1204	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe	88
PID 1204 wrote to memory of 5028	1204	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe	88
PID 1204 wrote to memory of 5028	1204	8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe	88

C:\Users\Admin\AppData\Local\Temp\8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe
"C:\Users\Admin\AppData\Local\Temp\8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1204
- C:\Users\Admin\AppData\Local\Temp\8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe
  "C:\Users\Admin\AppData\Local\Temp\8d9cacf5c0689e332f4e043117ecdc533edf1b52b65179885ceb284ff706a6fe.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:5028
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 5028 -s 1756
    3⤵
    - Program crash
    PID:2320

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 5028 -ip 5028
1⤵
PID:3060

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

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\Microsoft\Windows\Start Menu\eksportafgrde.ini

Filesize
38B

MD5
a0d91a2f9acb4dec3b5260aba27839c4

SHA1
8a9037c691a2bdeebcab8bf3d4c954e62aca9207

SHA256
773cd6fba7d53550b4c41aa889e330b744a7a579df2bb02212773b67e72f5844

SHA512
d3df7852aea197e901c787cd8d943faaa30ee9a6678c4853ed0bb494679897854e4e7556f420f1c176443a485cf1e02e0b4bff86f8da4017a053362b2c9a0608

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsjB75B.tmp\System.dll

Filesize
12KB

MD5
12b140583e3273ee1f65016becea58c4

SHA1
92df24d11797fefd2e1f8d29be9dfd67c56c1ada

SHA256
014f1dfeb842cf7265a3644bc6903c592abe9049bfc7396829172d3d72c4d042

SHA512
49ffdfa1941361430b6acb3555fd3aa05e4120f28cbdf7ceaa2af5937d0b8cccd84471cf63f06f97cf203b4aa20f226bdad082e9421b8e6b62ab6e1e9fc1e68a

Download Submit
C:\Windows\Resources\synderegistres.lnk

Filesize
850B

MD5
b56043557b75f6cbd42fa1c1e40783f1

SHA1
260a58c95b702809cf2052d726dfa845e6031e7c

SHA256
ac5b7c1449548986e2565845069b9802432241b97b19a95e5e4b91d853d19bda

SHA512
4027eb73ee9cbfb26211dac285ccba4f389e04dc56ae9bb3286d2ce56200112387eb81f24bd3bd129f8a13ff7b9b27ef2cf74713f4ffc34843abe591cc182753

Download Submit
memory/1204-826-0x00000000034C0000-0x0000000004989000-memory.dmp

Filesize
20.8MB

Download
memory/1204-827-0x0000000077261000-0x0000000077381000-memory.dmp

Filesize
1.1MB

Download
memory/1204-828-0x0000000073F55000-0x0000000073F56000-memory.dmp

Filesize
4KB

Download
memory/1204-830-0x00000000034C0000-0x0000000004989000-memory.dmp

Filesize
20.8MB

Download
memory/5028-831-0x0000000001660000-0x0000000002B29000-memory.dmp

Filesize
20.8MB

Download
memory/5028-829-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/5028-832-0x00000000772E8000-0x00000000772E9000-memory.dmp

Filesize
4KB

Download
memory/5028-833-0x0000000077305000-0x0000000077306000-memory.dmp

Filesize
4KB

Download
memory/5028-837-0x0000000001660000-0x0000000002B29000-memory.dmp

Filesize
20.8MB

Download
memory/5028-838-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/5028-839-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/5028-840-0x0000000077261000-0x0000000077381000-memory.dmp

Filesize
1.1MB

Download
memory/5028-841-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/5028-842-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/5028-843-0x0000000001660000-0x0000000002B29000-memory.dmp

Filesize
20.8MB

Download

Analysis

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