guloader | d7439af0827a632fe9730a7dd2585a2fb5b0af71c312cdeb49e6a738a9133400

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

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
behavioral1/memory/1248-457-0x0000000000450000-0x00000000014B2000-memory.dmp	family_snakekeylogger
behavioral1/memory/1248-458-0x0000000000450000-0x0000000000476000-memory.dmp	family_snakekeylogger

Loads dropped DLL 2 IoCs

pid	Process
2412	rtransferencia-.exe
2412	rtransferencia-.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

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rtransferencia-.exe
Key opened	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rtransferencia-.exe
Key opened	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\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
3	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
1248	rtransferencia-.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2412	rtransferencia-.exe
1248	rtransferencia-.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2412 set thread context of 1248	2412	rtransferencia-.exe	31

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
1248	rtransferencia-.exe
1248	rtransferencia-.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2412	rtransferencia-.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1248	rtransferencia-.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2412 wrote to memory of 1248	2412	rtransferencia-.exe	31
PID 2412 wrote to memory of 1248	2412	rtransferencia-.exe	31
PID 2412 wrote to memory of 1248	2412	rtransferencia-.exe	31
PID 2412 wrote to memory of 1248	2412	rtransferencia-.exe	31
PID 2412 wrote to memory of 1248	2412	rtransferencia-.exe	31
PID 2412 wrote to memory of 1248	2412	rtransferencia-.exe	31

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rtransferencia-.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\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:2412
- 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:1248

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

Email Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
742B

MD5
9558d5af9c4876c995394d380d41bf2d

SHA1
bb0f8e279338191fddb9d822b7c78cb494680522

SHA256
13ab5fa183a88d67a0a82365c2ceb74603f6f5b146c665633a0746a95eaaf528

SHA512
15b5fb32419e63b207a85af305386e96dd4901cbac534739082f239318bca7825170cd4d4dc3d6f2bc9d94156f1fc75a80dfeccbf37d65b31d7ab17263e6cac5

Download Submit
\Users\Admin\AppData\Local\Temp\nsyEF9D.tmp\System.dll

Filesize
11KB

MD5
cf85183b87314359488b850f9e97a698

SHA1
6b6c790037eec7ebea4d05590359cb4473f19aea

SHA256
3b6a5cb2a3c091814fce297c04fb677f72732fb21615102c62a195fdc2e7dfac

SHA512
fe484b3fc89aeed3a6b71b90b90ea11a787697e56be3077154b6ddc2646850f6c38589ed422ff792e391638a80a778d33f22e891e76b5d65896c6fb4696a2c3b

Download Submit
memory/1248-433-0x00000000773A0000-0x0000000077549000-memory.dmp

Filesize
1.7MB

Download
memory/1248-456-0x0000000000450000-0x00000000014B2000-memory.dmp

Filesize
16.4MB

Download
memory/1248-457-0x0000000000450000-0x00000000014B2000-memory.dmp

Filesize
16.4MB

Download
memory/1248-458-0x0000000000450000-0x0000000000476000-memory.dmp

Filesize
152KB

Download
memory/2412-429-0x0000000003620000-0x0000000005B71000-memory.dmp

Filesize
37.3MB

Download
memory/2412-430-0x0000000003620000-0x0000000005B71000-memory.dmp

Filesize
37.3MB

Download
memory/2412-432-0x00000000773A0000-0x0000000077549000-memory.dmp

Filesize
1.7MB

Download
memory/2412-431-0x00000000773A1000-0x00000000774A2000-memory.dmp

Filesize
1.0MB

Download
memory/2412-434-0x0000000003620000-0x0000000005B71000-memory.dmp

Filesize
37.3MB

Download

Analysis

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