guloader | ba23a849efc1bdb4978b8d08718817580952ec7ab96ae2d3e017a6c842333266

General

Target

Brushane.exe
Size

959KB
MD5

7523e26a589a9ed91a3f5433a2a42890
SHA1

0ef67fa7d8e5df3fb9e85dac5045904db4bab542
SHA256

ba23a849efc1bdb4978b8d08718817580952ec7ab96ae2d3e017a6c842333266
SHA512

fbc493ce1882ba0bc7e5d269b2432f496e6a4aa36b71cc099323d65a37a13486b40a010445ade2c07bf999ca64bb7e68ba88f3c591a01807cbd758e736d71970
SSDEEP

24576:DfYzitFHRy547Qii72S9qeQRXEOlyGmsYu8g7++072+W7v:rYytY72S9qlXEpG8u8gswv

Score

10^/10

guloader vipkeylogger collection discovery downloader keylogger spyware stealer

Malware Config

Extracted

Family

vipkeylogger

C2

https://api.telegram.org/bot8038642235:AAFAj74gXyoCoaunYg31YHOI0nBIq-BQIjI/sendMessage?chat_id=8150022612

Signatures

Guloader family
guloader
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
VIPKeylogger
VIPKeylogger is a keylogger and infostealer written in C# and it resembles SnakeKeylogger that was found in 2020.
stealer keylogger vipkeylogger
Vipkeylogger family
vipkeylogger

Loads dropped DLL 2 IoCs

pid	Process
884	Brushane.exe
884	Brushane.exe

Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
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

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-22591836-1183090055-1220658180-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Brushane.exe
Key opened	\REGISTRY\USER\S-1-5-21-22591836-1183090055-1220658180-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Brushane.exe
Key opened	\REGISTRY\USER\S-1-5-21-22591836-1183090055-1220658180-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Brushane.exe

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

Web Service

T1102

flow	ioc
31	drive.google.com
32	drive.google.com

Looks up external IP address via web service 3 IoCs

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

flow	ioc
44	checkip.dyndns.org
46	reallyfreegeoip.org
47	reallyfreegeoip.org

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
1428	Brushane.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
884	Brushane.exe
1428	Brushane.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\0409\Concubitus.ini	Brushane.exe

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217
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	Brushane.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Brushane.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1428	Brushane.exe
1428	Brushane.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
884	Brushane.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1428	Brushane.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 884 wrote to memory of 1428	884	Brushane.exe	95
PID 884 wrote to memory of 1428	884	Brushane.exe	95
PID 884 wrote to memory of 1428	884	Brushane.exe	95
PID 884 wrote to memory of 1428	884	Brushane.exe	95

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-22591836-1183090055-1220658180-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Brushane.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-22591836-1183090055-1220658180-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Brushane.exe

C:\Users\Admin\AppData\Local\Temp\Brushane.exe
"C:\Users\Admin\AppData\Local\Temp\Brushane.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:884
- C:\Users\Admin\AppData\Local\Temp\Brushane.exe
  "C:\Users\Admin\AppData\Local\Temp\Brushane.exe"
  2⤵
  - Accesses Microsoft Outlook profiles
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - outlook_office_path
  - outlook_win_path
  PID:1428

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

2

T1552

Credentials In Files

2

T1552.001

Discovery

Browser Information Discovery

1

T1217

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsg96F1.tmp\System.dll

Filesize
12KB

MD5
192639861e3dc2dc5c08bb8f8c7260d5

SHA1
58d30e460609e22fa0098bc27d928b689ef9af78

SHA256
23d618a0293c78ce00f7c6e6dd8b8923621da7dd1f63a070163ef4c0ec3033d6

SHA512
6e573d8b2ef6ed719e271fd0b2fd9cd451f61fc9a9459330108d6d7a65a0f64016303318cad787aa1d5334ba670d8f1c7c13074e1be550b4a316963ecc465cdc

Download Submit
memory/884-27-0x0000000077431000-0x0000000077551000-memory.dmp

Filesize
1.1MB

Download
memory/884-29-0x0000000074755000-0x0000000074756000-memory.dmp

Filesize
4KB

Download
memory/884-28-0x0000000077431000-0x0000000077551000-memory.dmp

Filesize
1.1MB

Download
memory/1428-30-0x0000000001700000-0x0000000004DA7000-memory.dmp

Filesize
54.7MB

Download
memory/1428-31-0x00000000774B8000-0x00000000774B9000-memory.dmp

Filesize
4KB

Download
memory/1428-32-0x00000000774D5000-0x00000000774D6000-memory.dmp

Filesize
4KB

Download
memory/1428-45-0x00000000004A0000-0x00000000016F4000-memory.dmp

Filesize
18.3MB

Download
memory/1428-48-0x0000000077431000-0x0000000077551000-memory.dmp

Filesize
1.1MB

Download
memory/1428-46-0x00000000004A0000-0x00000000016F4000-memory.dmp

Filesize
18.3MB

Download
memory/1428-49-0x00000000721AE000-0x00000000721AF000-memory.dmp

Filesize
4KB

Download
memory/1428-50-0x00000000004A0000-0x00000000004EA000-memory.dmp

Filesize
296KB

Download
memory/1428-51-0x0000000037BA0000-0x0000000038144000-memory.dmp

Filesize
5.6MB

Download
memory/1428-52-0x0000000038150000-0x00000000381EC000-memory.dmp

Filesize
624KB

Download
memory/1428-47-0x0000000001700000-0x0000000004DA7000-memory.dmp

Filesize
54.7MB

Download
memory/1428-53-0x0000000077431000-0x0000000077551000-memory.dmp

Filesize
1.1MB

Download
memory/1428-54-0x00000000721A0000-0x0000000072950000-memory.dmp

Filesize
7.7MB

Download
memory/1428-55-0x0000000038730000-0x00000000388F2000-memory.dmp

Filesize
1.8MB

Download
memory/1428-56-0x0000000038900000-0x0000000038950000-memory.dmp

Filesize
320KB

Download
memory/1428-58-0x00000000721AE000-0x00000000721AF000-memory.dmp

Filesize
4KB

Download
memory/1428-59-0x00000000389D0000-0x0000000038EFC000-memory.dmp

Filesize
5.2MB

Download
memory/1428-60-0x00000000721A0000-0x0000000072950000-memory.dmp

Filesize
7.7MB

Download
memory/1428-61-0x0000000038F50000-0x0000000038FE2000-memory.dmp

Filesize
584KB

Download
memory/1428-62-0x0000000039040000-0x000000003904A000-memory.dmp

Filesize
40KB

Download

Analysis

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