guloader | d7439af0827a632fe9730a7dd2585a2fb5b0af71c312cdeb49e6a738a9133400

Analysis

max time kernel
147s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
22-10-2024 20:01

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General

Target

rtransferencia-.exe
Size

539KB
MD5

4183d5786fe2a0e4563c5a0cf57d92f6
SHA1

2fc414de34b92a56712c6684c84af970037b81f5
SHA256

d7439af0827a632fe9730a7dd2585a2fb5b0af71c312cdeb49e6a738a9133400
SHA512

8d86235c4d4060d656a1a2349a43e7ddfc9d036d476dbf8b9d404af060b754eb33bdc74ee03881f769fd19a60b87daefc696e48ee33f40b1e24f358dfe9a87fc
SSDEEP

12288:DMq47lWuTq/3dOxotjTps+ZHmkHN3HiPCpfBVxe:I/WuTsoWt1HnHpHiwVI

Score

10^/10

guloader snakekeylogger collection discovery downloader keylogger spyware stealer

Malware Config

Extracted

Credentials

Protocol: smtp
Host:
mail.mgcconstrucciones.com.co
Port:
587
Username:
[email protected]
Password:
Mgonzalez@2021.

Extracted

Family

snakekeylogger

Credentials

Protocol: smtp
Host:
mail.mgcconstrucciones.com.co
Port:
587
Username:
[email protected]
Password:
Mgonzalez@2021.
Email To:
[email protected]

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Snake Keylogger
Keylogger and Infostealer first seen in November 2020.
stealer keylogger snakekeylogger

Snake Keylogger payload 2 IoCs

resource	yara_rule
behavioral2/memory/3944-448-0x0000000000450000-0x00000000016A4000-memory.dmp	family_snakekeylogger
behavioral2/memory/3944-449-0x0000000000450000-0x0000000000476000-memory.dmp	family_snakekeylogger

Loads dropped DLL 2 IoCs

pid	Process
3784	rtransferencia-.exe
3784	rtransferencia-.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-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rtransferencia-.exe
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rtransferencia-.exe
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rtransferencia-.exe

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

Web Service

T1102

flow	ioc
25	drive.google.com
26	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
38	checkip.dyndns.org

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
3944	rtransferencia-.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3784	rtransferencia-.exe
3944	rtransferencia-.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3784 set thread context of 3944	3784	rtransferencia-.exe	95

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\Trnregimenternes\totalsanerende.Obs202	rtransferencia-.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	rtransferencia-.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rtransferencia-.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3944	rtransferencia-.exe
3944	rtransferencia-.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3784	rtransferencia-.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3944	rtransferencia-.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3784 wrote to memory of 3944	3784	rtransferencia-.exe	95
PID 3784 wrote to memory of 3944	3784	rtransferencia-.exe	95
PID 3784 wrote to memory of 3944	3784	rtransferencia-.exe	95
PID 3784 wrote to memory of 3944	3784	rtransferencia-.exe	95
PID 3784 wrote to memory of 3944	3784	rtransferencia-.exe	95

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rtransferencia-.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rtransferencia-.exe

C:\Users\Admin\AppData\Local\Temp\rtransferencia-.exe
"C:\Users\Admin\AppData\Local\Temp\rtransferencia-.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3784
- C:\Users\Admin\AppData\Local\Temp\rtransferencia-.exe
  "C:\Users\Admin\AppData\Local\Temp\rtransferencia-.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:3944

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsdC12E.tmp\System.dll

Filesize
11KB

MD5
cf85183b87314359488b850f9e97a698

SHA1
6b6c790037eec7ebea4d05590359cb4473f19aea

SHA256
3b6a5cb2a3c091814fce297c04fb677f72732fb21615102c62a195fdc2e7dfac

SHA512
fe484b3fc89aeed3a6b71b90b90ea11a787697e56be3077154b6ddc2646850f6c38589ed422ff792e391638a80a778d33f22e891e76b5d65896c6fb4696a2c3b

Download Submit
C:\Users\Admin\Music\incinerations.lnk

Filesize
754B

MD5
e23c6259a67e2a24286a1a6707ed0a03

SHA1
17c6fff9819971f48f3d140e6997ffa6b8928a4d

SHA256
81778c11edd3f314ba5d33639adb95b17944fbb37c222c1dec800ce617a7c498

SHA512
33e17f8e49c2ed942cc9f6c72db7ef4219749724c5ae5be773afbcc4be19e179fa859fa6c9dfe39a98244a77801549a5031659a432166a639c79faaed904c30a

Download Submit
memory/3784-429-0x0000000003850000-0x0000000005DA1000-memory.dmp

Filesize
37.3MB

Download
memory/3784-430-0x0000000003850000-0x0000000005DA1000-memory.dmp

Filesize
37.3MB

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memory/3784-431-0x0000000077DD1000-0x0000000077EF1000-memory.dmp

Filesize
1.1MB

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memory/3784-433-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/3784-432-0x0000000077DD1000-0x0000000077EF1000-memory.dmp

Filesize
1.1MB

Download
memory/3784-434-0x0000000003850000-0x0000000005DA1000-memory.dmp

Filesize
37.3MB

Download
memory/3944-435-0x00000000016B0000-0x0000000003C01000-memory.dmp

Filesize
37.3MB

Download
memory/3944-448-0x0000000000450000-0x00000000016A4000-memory.dmp

Filesize
18.3MB

Download
memory/3944-449-0x0000000000450000-0x0000000000476000-memory.dmp

Filesize
152KB

Download
memory/3944-451-0x0000000036C20000-0x00000000371C4000-memory.dmp

Filesize
5.6MB

Download
memory/3944-452-0x00000000016B0000-0x0000000003C01000-memory.dmp

Filesize
37.3MB

Download
memory/3944-453-0x0000000036A80000-0x0000000036B1C000-memory.dmp

Filesize
624KB

Download
memory/3944-454-0x00000000375C0000-0x0000000037610000-memory.dmp

Filesize
320KB

Download
memory/3944-455-0x0000000037610000-0x00000000377D2000-memory.dmp

Filesize
1.8MB

Download
memory/3944-458-0x00000000343A0000-0x0000000034432000-memory.dmp

Filesize
584KB

Download
memory/3944-459-0x0000000034450000-0x000000003445A000-memory.dmp

Filesize
40KB

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