guloader | 0f1f12a6a94145ece83cc92eda1d01b1b79bb03e17bc535288fc1c94b08a5f4a

General

Target

Payroll List_pdf.exe
Size

610KB
MD5

b0e2a6d88d1623907c64749a65a2ee32
SHA1

37875ea45c249888200062da03036e838aa95d7b
SHA256

0f1f12a6a94145ece83cc92eda1d01b1b79bb03e17bc535288fc1c94b08a5f4a
SHA512

20252a1842e275d8b4931c3ce28d4bd4b0ec52b99a63c4355a90301863c74987d5b3a50b119cc7956ebd63e2b777631bbe4eea07674f1d3da59e3ea6fffbd7d8
SSDEEP

12288:5UVC9GIaG5ez1uNnuJ5Zbr4wi9ptkHDF9AUiDeDx3E:KVzK5ez1IuJ5FrTOsjqDeDB

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
2924	Payroll List_pdf.exe
2924	Payroll List_pdf.exe

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

Web Service

T1102

flow	ioc
22	drive.google.com
23	drive.google.com

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
3764	Payroll List_pdf.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2924	Payroll List_pdf.exe
3764	Payroll List_pdf.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	Payroll List_pdf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Payroll List_pdf.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe
3764	Payroll List_pdf.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2924	Payroll List_pdf.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2924 wrote to memory of 3764	2924	Payroll List_pdf.exe	89
PID 2924 wrote to memory of 3764	2924	Payroll List_pdf.exe	89
PID 2924 wrote to memory of 3764	2924	Payroll List_pdf.exe	89
PID 2924 wrote to memory of 3764	2924	Payroll List_pdf.exe	89

C:\Users\Admin\AppData\Local\Temp\Payroll List_pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Payroll List_pdf.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2924
- C:\Users\Admin\AppData\Local\Temp\Payroll List_pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\Payroll List_pdf.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:3764

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

C:\Users\Admin\AppData\Local\Temp\nsk9367.tmp\System.dll

Filesize
11KB

MD5
2ae993a2ffec0c137eb51c8832691bcb

SHA1
98e0b37b7c14890f8a599f35678af5e9435906e1

SHA256
681382f3134de5c6272a49dd13651c8c201b89c247b471191496e7335702fa59

SHA512
2501371eb09c01746119305ba080f3b8c41e64535ff09cee4f51322530366d0bd5322ea5290a466356598027e6cda8ab360caef62dcaf560d630742e2dd9bcd9

Download Submit
memory/2924-18-0x0000000077821000-0x0000000077941000-memory.dmp

Filesize
1.1MB

Download
memory/2924-20-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/2924-19-0x0000000077821000-0x0000000077941000-memory.dmp

Filesize
1.1MB

Download
memory/3764-22-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-21-0x0000000001660000-0x000000000684D000-memory.dmp

Filesize
81.9MB

Download
memory/3764-23-0x00000000778A8000-0x00000000778A9000-memory.dmp

Filesize
4KB

Download
memory/3764-24-0x00000000778C5000-0x00000000778C6000-memory.dmp

Filesize
4KB

Download
memory/3764-37-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-38-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-39-0x0000000000401000-0x0000000000402000-memory.dmp

Filesize
4KB

Download
memory/3764-40-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-41-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-42-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-43-0x0000000077821000-0x0000000077941000-memory.dmp

Filesize
1.1MB

Download
memory/3764-44-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-45-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-46-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-47-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-48-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-50-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-52-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3764-55-0x0000000001660000-0x000000000684D000-memory.dmp

Filesize
81.9MB

Download

Analysis

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