guloader | 2c02e5bec85fedefe1d21d2cc02b0d7e91eebfedcb53f444127463987de67bc0

General

Target

OPH21.bat.exe
Size

622KB
MD5

d5823a84e4b8e1cf3d66e71c0bfdc634
SHA1

6f21f997a4f810f899bfe07fbeeb231c3594b773
SHA256

2c02e5bec85fedefe1d21d2cc02b0d7e91eebfedcb53f444127463987de67bc0
SHA512

88cd67b071413ce6cee8553e64c007ae16c7b83efcc271fdf8887c69a1835f0983a6f093a67103048ed1182432fabc566b42ebf5a5f80811eaece0b1750f6af7
SSDEEP

6144:sMm4CCHM4NL26fgvQVA2QNzTlIWFLVEXeVwp9gSGmsBYnrfs:sMwg/NL26fgvQK2QN6WRVAgSGm+Ynrfs

Score

10^/10

guloader snakekeylogger collection downloader keylogger stealer

Malware Config

Extracted

Family

snakekeylogger

Credentials

Protocol: smtp
Host:
mail.eversafe.pt
Port:
587
Username:
[email protected]
Password:
Ev3rsaf3_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/4916-164-0x0000000000400000-0x000000000062B000-memory.dmp	family_snakekeylogger
behavioral2/memory/4916-166-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger

Checks QEMU agent file 2 TTPs 2 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	OPH21.bat.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	caspol.exe

Loads dropped DLL 2 IoCs

pid	Process
2300	OPH21.bat.exe
2300	OPH21.bat.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	caspol.exe
Key opened	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	caspol.exe
Key opened	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	caspol.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

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
62	checkip.dyndns.org

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4916	caspol.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2300	OPH21.bat.exe
4916	caspol.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2300 set thread context of 4916	2300	OPH21.bat.exe	93

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2360	4916	WerFault.exe	93

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4916	caspol.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2300	OPH21.bat.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4916	caspol.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2300 wrote to memory of 4916	2300	OPH21.bat.exe	93
PID 2300 wrote to memory of 4916	2300	OPH21.bat.exe	93
PID 2300 wrote to memory of 4916	2300	OPH21.bat.exe	93
PID 2300 wrote to memory of 4916	2300	OPH21.bat.exe	93

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	caspol.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	caspol.exe

C:\Users\Admin\AppData\Local\Temp\OPH21.bat.exe
"C:\Users\Admin\AppData\Local\Temp\OPH21.bat.exe"
1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2300
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\caspol.exe
  "C:\Users\Admin\AppData\Local\Temp\OPH21.bat.exe"
  2⤵
  - Checks QEMU agent file
  - Accesses Microsoft Outlook profiles
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - outlook_office_path
  - outlook_win_path
  PID:4916
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4916 -s 2304
    3⤵
    - Program crash
    PID:2360

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4916 -ip 4916
1⤵
PID:4004

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Web Service

1

T1102

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsvFB5D.tmp\AdvSplash.dll

Filesize
6KB

MD5
1871af84805057b5ebc05ee46b56625d

SHA1
50e1c315ad30f5f3f300c7cd9dd0d5d626fe0167

SHA256
62b3db0446750ca9fd693733eec927acc1f50012a47785343286e63b650b7621

SHA512
c1979ee98dfdb807776c439218528d80b4b244a87e692f1538e40f9c2c82db8b77485eb1429325b6f44419bf1f4cd454e43ff381eff077a8b4f4d9eb0d7e54d4

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsvFB5D.tmp\System.dll

Filesize
12KB

MD5
564bb0373067e1785cba7e4c24aab4bf

SHA1
7c9416a01d821b10b2eef97b80899d24014d6fc1

SHA256
7a9ddee34562cd3703f1502b5c70e99cd5bba15de2b6845a3555033d7f6cb2a5

SHA512
22c61a323cb9293d7ec5c7e7e60674d0e2f7b29d55be25eb3c128ea2cd7440a1400cee17c43896b996278007c0d247f331a9b8964e3a40a0eb1404a9596c4472

Download Submit
memory/2300-148-0x00000000049C0000-0x0000000006AC2000-memory.dmp

Filesize
33.0MB

Download
memory/2300-149-0x00000000049C0000-0x0000000006AC2000-memory.dmp

Filesize
33.0MB

Download
memory/4916-150-0x0000000000F00000-0x0000000003002000-memory.dmp

Filesize
33.0MB

Download
memory/4916-151-0x0000000000F00000-0x0000000003002000-memory.dmp

Filesize
33.0MB

Download
memory/4916-164-0x0000000000400000-0x000000000062B000-memory.dmp

Filesize
2.2MB

Download
memory/4916-165-0x0000000000F00000-0x0000000003002000-memory.dmp

Filesize
33.0MB

Download
memory/4916-166-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/4916-167-0x00000000363B0000-0x0000000036954000-memory.dmp

Filesize
5.6MB

Download
memory/4916-168-0x0000000035E00000-0x0000000035E9C000-memory.dmp

Filesize
624KB

Download
memory/4916-169-0x0000000036010000-0x0000000036020000-memory.dmp

Filesize
64KB

Download
memory/4916-171-0x0000000000F00000-0x0000000003002000-memory.dmp

Filesize
33.0MB

Download

Analysis

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