guloader | 8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647

General

Target

8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe
Size

737KB
MD5

eb15bbefe683ef09c1c5c1bf5068dd71
SHA1

0b613412103c088372fb19656152d21d6a5db027
SHA256

8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647
SHA512

efc5e6c51a7d815294bf6de694803165c7e56e456e1cf350539e0299f66af3d5dc346bd5d98df151f51ee4fd35dccad98a113d22354f6cae4cbf0d31d823c45f
SSDEEP

12288:xlYZmcRHOys4LnDPb/RNXcIYSBZZKS2vHll7Q9hSCjJgroHaPdl7Fh:UmcdOt4LrXcAvKSErsOk+rddd3

Score

10^/10

guloader discovery downloader evasion spyware stealer

Malware Config

Signatures

Guloader family
guloader
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Disables Task Manager via registry modification
evasion

Loads dropped DLL 2 IoCs

pid	Process
2392	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe
2392	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

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

Web Service

T1102

flow	ioc
4	drive.google.com
5	drive.google.com

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
14	checkip.dyndns.org

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2264	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2392	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe
2264	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2392 set thread context of 2264	2392	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe	31

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	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2392	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2264	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2392 wrote to memory of 2264	2392	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe	31
PID 2392 wrote to memory of 2264	2392	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe	31
PID 2392 wrote to memory of 2264	2392	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe	31
PID 2392 wrote to memory of 2264	2392	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe	31
PID 2392 wrote to memory of 2264	2392	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe	31
PID 2392 wrote to memory of 2264	2392	8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe	31

C:\Users\Admin\AppData\Local\Temp\8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe
"C:\Users\Admin\AppData\Local\Temp\8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2392
- C:\Users\Admin\AppData\Local\Temp\8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe
  "C:\Users\Admin\AppData\Local\Temp\8250c1a738d87ed5e8f7d743fa4b523a8c662c568f97b05de5712e9f2c39c647.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:2264

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\nstC6F9.tmp\System.dll

Filesize
11KB

MD5
fc90dfb694d0e17b013d6f818bce41b0

SHA1
3243969886d640af3bfa442728b9f0dff9d5f5b0

SHA256
7fe77ca13121a113c59630a3dba0c8aaa6372e8082393274da8f8608c4ce4528

SHA512
324f13aa7a33c6408e2a57c3484d1691ecee7c3c1366de2bb8978c8dc66b18425d8cab5a32d1702c13c43703e36148a022263de7166afdce141da2b01169f1c6

Download Submit
memory/2264-18-0x00000000775B0000-0x0000000077759000-memory.dmp

Filesize
1.7MB

Download
memory/2264-39-0x00000000004B0000-0x0000000001512000-memory.dmp

Filesize
16.4MB

Download
memory/2264-40-0x00000000004B0000-0x0000000001512000-memory.dmp

Filesize
16.4MB

Download
memory/2264-41-0x00000000004B0000-0x00000000004CE000-memory.dmp

Filesize
120KB

Download
memory/2392-15-0x0000000003660000-0x0000000004C27000-memory.dmp

Filesize
21.8MB

Download
memory/2392-16-0x00000000775B1000-0x00000000776B2000-memory.dmp

Filesize
1.0MB

Download
memory/2392-17-0x00000000775B0000-0x0000000077759000-memory.dmp

Filesize
1.7MB

Download
memory/2392-19-0x0000000003660000-0x0000000004C27000-memory.dmp

Filesize
21.8MB

Download

Analysis

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