guloader | 8c09ef66ed1727bbffd30616609a863f23753d96351a4d363cd9934a253bebcf

Analysis

max time kernel
94s
max time network
98s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
08-10-2024 15:58

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General

Target

Percolator118.exe
Size

611KB
MD5

79d24110039455ea1adf512f677555c5
SHA1

7d299570abb877e5aa0ed939423d8745e990baee
SHA256

4fdc7af86220a1968795c45d06322fa592103d166876814e7f0140faee1398a8
SHA512

a238e140f013bbde7b37bfbf1eaab9a68fff7eac75c73fe9f7b034701bcf4b5259ecacd52e4bc9963f7792c3c4f2f3653f10eabc14c3d55fd2af29f2c812ff5a
SSDEEP

12288:s22tQucNsuV23uYIdxJnPi1JwMMq906OL8Zq:s22twVV0u5x5PigX6OX

Score

10^/10

guloader discovery downloader

Malware Config

Signatures

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

Loads dropped DLL 1 IoCs

pid	Process
4356	Percolator118.exe

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

Web Service

T1102

flow	ioc
16	drive.google.com
17	drive.google.com

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\nonsurgically\skmbillede.smr	Percolator118.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4460	Percolator118.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4356	Percolator118.exe
4460	Percolator118.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4356 set thread context of 4460	4356	Percolator118.exe	87

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Fljtenists.ini	Percolator118.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	Percolator118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Percolator118.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
4460	Percolator118.exe
4460	Percolator118.exe
4460	Percolator118.exe
4460	Percolator118.exe
4460	Percolator118.exe
4460	Percolator118.exe
4460	Percolator118.exe
4460	Percolator118.exe
4460	Percolator118.exe
4460	Percolator118.exe
4460	Percolator118.exe
4460	Percolator118.exe
4460	Percolator118.exe
4460	Percolator118.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4356	Percolator118.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4356 wrote to memory of 4460	4356	Percolator118.exe	87
PID 4356 wrote to memory of 4460	4356	Percolator118.exe	87
PID 4356 wrote to memory of 4460	4356	Percolator118.exe	87
PID 4356 wrote to memory of 4460	4356	Percolator118.exe	87
PID 4356 wrote to memory of 4460	4356	Percolator118.exe	87

C:\Users\Admin\AppData\Local\Temp\Percolator118.exe
"C:\Users\Admin\AppData\Local\Temp\Percolator118.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4356
- C:\Users\Admin\AppData\Local\Temp\Percolator118.exe
  "C:\Users\Admin\AppData\Local\Temp\Percolator118.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:4460

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsdC17C.tmp\System.dll

Filesize
11KB

MD5
3f176d1ee13b0d7d6bd92e1c7a0b9bae

SHA1
fe582246792774c2c9dd15639ffa0aca90d6fd0b

SHA256
fa4ab1d6f79fd677433a31ada7806373a789d34328da46ccb0449bbf347bd73e

SHA512
0a69124819b7568d0dea4e9e85ce8fe61c7ba697c934e3a95e2dcfb9f252b1d9da7faf8774b6e8efd614885507acc94987733eba09a2f5e7098b774dfc8524b6

Download Submit
memory/4356-30-0x0000000002B50000-0x0000000005500000-memory.dmp

Filesize
41.7MB

Download
memory/4356-11-0x0000000002B50000-0x0000000005500000-memory.dmp

Filesize
41.7MB

Download
memory/4356-12-0x0000000076FE1000-0x0000000077101000-memory.dmp

Filesize
1.1MB

Download
memory/4356-14-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/4356-13-0x0000000076FE1000-0x0000000077101000-memory.dmp

Filesize
1.1MB

Download
memory/4356-10-0x0000000002B50000-0x0000000005500000-memory.dmp

Filesize
41.7MB

Download
memory/4460-15-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4460-16-0x0000000001660000-0x0000000004010000-memory.dmp

Filesize
41.7MB

Download
memory/4460-29-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4460-31-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4460-32-0x0000000001660000-0x0000000004010000-memory.dmp

Filesize
41.7MB

Download
memory/4460-35-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download