guloader | de86179c7ad9444d2f649c0158dfb72a8203af1e716f706e3fb0955e36bedf8d

General

Target

Gruss.exe
Size

747KB
MD5

be12d58b91d733a5485688b63aaa4b32
SHA1

ddd0a6456ef8fdb505d2e8c5cbe6321742459298
SHA256

de86179c7ad9444d2f649c0158dfb72a8203af1e716f706e3fb0955e36bedf8d
SHA512

5b5e2f04e6cf3dc27ea5451ef7416304451db73cb88902358282d72bf6697491e494d7c652fde297ee948f04ebbf8538385b61286a108cc1c24f07012b9aab87
SSDEEP

12288:0F9YSXf0yM0l9r1Yk2y38SeD83S1qIFRDRxnE8UML789zUO9vVOI0emBmL:kJXlB9rqY3lRsdrxnlGUOdb0emBmL

Score

10^/10

guloader vipkeylogger collection discovery downloader keylogger spyware stealer

Malware Config

Extracted

Family

vipkeylogger

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

Downloads MZ/PE file 1 IoCs

flow	pid	Process
32	2560	Process not Found

Loads dropped DLL 2 IoCs

pid	Process
3060	Gruss.exe
3060	Gruss.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-1-5-21-1318997816-2171176372-1451785247-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Gruss.exe
Key opened	\REGISTRY\USER\S-1-5-21-1318997816-2171176372-1451785247-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Gruss.exe
Key opened	\REGISTRY\USER\S-1-5-21-1318997816-2171176372-1451785247-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Gruss.exe

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

Web Service

T1102

flow	ioc
13	drive.google.com
16	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
47	checkip.dyndns.org
59	reallyfreegeoip.org
60	reallyfreegeoip.org

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4604	Gruss.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3060	Gruss.exe
4604	Gruss.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\bedvelsens\Reaccelerates.ske	Gruss.exe
File opened for modification	C:\Program Files (x86)\Common Files\rhesusbarnet\teenfully.bra	Gruss.exe
File opened for modification	C:\Program Files (x86)\Common Files\infarkt.pla	Gruss.exe
File opened for modification	C:\Program Files (x86)\Unelaborated.non	Gruss.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\rothesay\Fallenternes.con	Gruss.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 3 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	Gruss.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Gruss.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MicrosoftEdgeUpdate.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4076	MicrosoftEdgeUpdate.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4604	Gruss.exe
4604	Gruss.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3060	Gruss.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4604	Gruss.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3060 wrote to memory of 4604	3060	Gruss.exe	90
PID 3060 wrote to memory of 4604	3060	Gruss.exe	90
PID 3060 wrote to memory of 4604	3060	Gruss.exe	90
PID 3060 wrote to memory of 4604	3060	Gruss.exe	90

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1318997816-2171176372-1451785247-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Gruss.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1318997816-2171176372-1451785247-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Gruss.exe

C:\Users\Admin\AppData\Local\Temp\Gruss.exe
"C:\Users\Admin\AppData\Local\Temp\Gruss.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3060
- C:\Users\Admin\AppData\Local\Temp\Gruss.exe
  "C:\Users\Admin\AppData\Local\Temp\Gruss.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:4604

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIyIiBpbnN0YWxsZGF0ZXRpbWU9IjE3MzkyODMzNzEiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4Mzc1NDE5Mjc1MzAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI0ODU2NTQwNjQ3Ii8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:4076

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

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
11KB

MD5
cf85183b87314359488b850f9e97a698

SHA1
6b6c790037eec7ebea4d05590359cb4473f19aea

SHA256
3b6a5cb2a3c091814fce297c04fb677f72732fb21615102c62a195fdc2e7dfac

SHA512
fe484b3fc89aeed3a6b71b90b90ea11a787697e56be3077154b6ddc2646850f6c38589ed422ff792e391638a80a778d33f22e891e76b5d65896c6fb4696a2c3b

Download Submit
C:\Users\Public\Pictures\fedtlderstvles.lnk

Filesize
902B

MD5
327bf6eed131d9b72fde58e52549c9a0

SHA1
f75f0b1e926c33e41b025ce753c685fb36889f7d

SHA256
b8a83eca5ce2399a2745c87ae7b650875fa878acaccdf90cc8ff62c238d48e75

SHA512
9227948cede5d677cdc6b50151cc3ca7fa5226213357247ea7d2ceccd95ec6151f87bf7c14e482dcfc06dfeb360af68a5f1ae22e5914d439b5e80099410d7a34

Download Submit
memory/3060-309-0x0000000002830000-0x0000000004351000-memory.dmp

Filesize
27.1MB

Download
memory/3060-310-0x0000000077B81000-0x0000000077CA1000-memory.dmp

Filesize
1.1MB

Download
memory/3060-312-0x0000000002830000-0x0000000004351000-memory.dmp

Filesize
27.1MB

Download
memory/4604-316-0x00000000016C0000-0x00000000031E1000-memory.dmp

Filesize
27.1MB

Download
memory/4604-332-0x0000000036110000-0x00000000366B4000-memory.dmp

Filesize
5.6MB

Download
memory/4604-315-0x0000000000460000-0x00000000016B4000-memory.dmp

Filesize
18.3MB

Download
memory/4604-311-0x00000000016C0000-0x00000000031E1000-memory.dmp

Filesize
27.1MB

Download
memory/4604-329-0x0000000000460000-0x00000000016B4000-memory.dmp

Filesize
18.3MB

Download
memory/4604-330-0x00000000016C0000-0x00000000031E1000-memory.dmp

Filesize
27.1MB

Download
memory/4604-331-0x0000000000460000-0x00000000004AA000-memory.dmp

Filesize
296KB

Download
memory/4604-313-0x00000000016C0000-0x00000000031E1000-memory.dmp

Filesize
27.1MB

Download
memory/4604-333-0x0000000035F90000-0x000000003602C000-memory.dmp

Filesize
624KB

Download
memory/4604-338-0x0000000036B80000-0x0000000036D42000-memory.dmp

Filesize
1.8MB

Download
memory/4604-339-0x00000000339B0000-0x0000000033A00000-memory.dmp

Filesize
320KB

Download
memory/4604-340-0x0000000036D50000-0x000000003727C000-memory.dmp

Filesize
5.2MB

Download
memory/4604-342-0x00000000034A0000-0x0000000003532000-memory.dmp

Filesize
584KB

Download
memory/4604-343-0x0000000003560000-0x000000000356A000-memory.dmp

Filesize
40KB

Download

Analysis

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