guloader | 2fe668d613b90d65a43c7d1c476fa44a55e41873b5f954d20e937326afe52939

General

Target

rStopfodringer.exe
Size

596KB
MD5

a37af26ae26b63490edd76beab0dbf8b
SHA1

f312edc243e20a46175b570aef59ef2c1ec87b8d
SHA256

2fe668d613b90d65a43c7d1c476fa44a55e41873b5f954d20e937326afe52939
SHA512

f55fc52553226defeea8f8f93b2f082917cc1cd07c95ff7b5ec8e76e2a646f7725b9e4d200c0fbc67f150c97c565cf3f2fef749b5b41ca2ad1ada60fb19dcd20
SSDEEP

12288:v22twSEXbeu5UtNK4zDdnPORvgwnBTSwLS906OL8:v22tBErr5KKCxPWJBeoP6OY

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
4248	rStopfodringer.exe

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

Web Service

T1102

flow	ioc
19	drive.google.com
18	drive.google.com

Drops file in System32 directory 1 IoCs

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

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4536	rStopfodringer.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4248	rStopfodringer.exe
4536	rStopfodringer.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4248 set thread context of 4536	4248	rStopfodringer.exe	87

Drops file in Program Files directory 1 IoCs

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

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
4536	rStopfodringer.exe
4536	rStopfodringer.exe
4536	rStopfodringer.exe
4536	rStopfodringer.exe
4536	rStopfodringer.exe
4536	rStopfodringer.exe
4536	rStopfodringer.exe
4536	rStopfodringer.exe
4536	rStopfodringer.exe
4536	rStopfodringer.exe
4536	rStopfodringer.exe
4536	rStopfodringer.exe
4536	rStopfodringer.exe
4536	rStopfodringer.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4248	rStopfodringer.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4248 wrote to memory of 4536	4248	rStopfodringer.exe	87
PID 4248 wrote to memory of 4536	4248	rStopfodringer.exe	87
PID 4248 wrote to memory of 4536	4248	rStopfodringer.exe	87
PID 4248 wrote to memory of 4536	4248	rStopfodringer.exe	87
PID 4248 wrote to memory of 4536	4248	rStopfodringer.exe	87

C:\Users\Admin\AppData\Local\Temp\rStopfodringer.exe
"C:\Users\Admin\AppData\Local\Temp\rStopfodringer.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:4248
- C:\Users\Admin\AppData\Local\Temp\rStopfodringer.exe
  "C:\Users\Admin\AppData\Local\Temp\rStopfodringer.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:4536

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\nsy9AAB.tmp\System.dll

Filesize
11KB

MD5
3f176d1ee13b0d7d6bd92e1c7a0b9bae

SHA1
fe582246792774c2c9dd15639ffa0aca90d6fd0b

SHA256
fa4ab1d6f79fd677433a31ada7806373a789d34328da46ccb0449bbf347bd73e

SHA512
0a69124819b7568d0dea4e9e85ce8fe61c7ba697c934e3a95e2dcfb9f252b1d9da7faf8774b6e8efd614885507acc94987733eba09a2f5e7098b774dfc8524b6

Download Submit
memory/4248-10-0x0000000002AC0000-0x0000000004782000-memory.dmp

Filesize
28.8MB

Download
memory/4248-11-0x0000000002AC0000-0x0000000004782000-memory.dmp

Filesize
28.8MB

Download
memory/4248-14-0x0000000010000000-0x0000000010006000-memory.dmp

Filesize
24KB

Download
memory/4248-13-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/4248-12-0x0000000077121000-0x0000000077241000-memory.dmp

Filesize
1.1MB

Download
memory/4248-34-0x0000000002AC0000-0x0000000004782000-memory.dmp

Filesize
28.8MB

Download
memory/4536-31-0x0000000001660000-0x0000000003322000-memory.dmp

Filesize
28.8MB

Download
memory/4536-17-0x00000000771A8000-0x00000000771A9000-memory.dmp

Filesize
4KB

Download
memory/4536-18-0x00000000771C5000-0x00000000771C6000-memory.dmp

Filesize
4KB

Download
memory/4536-16-0x0000000001660000-0x0000000003322000-memory.dmp

Filesize
28.8MB

Download
memory/4536-32-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4536-33-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4536-15-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4536-35-0x0000000077121000-0x0000000077241000-memory.dmp

Filesize
1.1MB

Download
memory/4536-36-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4536-37-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4536-38-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4536-41-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4536-42-0x0000000001660000-0x0000000003322000-memory.dmp

Filesize
28.8MB

Download

Analysis

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