guloader | cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8

General

Target

cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
Size

501KB
MD5

4c906f03f8cbdcd7c66a15f6c8498330
SHA1

91e1270fc52b760ff2913f2db910f78c6051b74d
SHA256

cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8
SHA512

2ca1a394952bf0cef296f9015585b9a3bc261958350ed19e43adc4e778050320d46ac7f1854093f330a4000e4123361765769db2a569f93750f917e10564f717
SSDEEP

12288:pbZxvzlLYN4fYSq7UpiiArc3mYAR27YAC1/:xZxpflpiFymHR2bI

Score

10^/10

guloader collection credential_access discovery downloader spyware stealer

Malware Config

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Detected Nirsoft tools 8 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral2/memory/2640-40-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/848-44-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/848-49-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/880-51-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/880-43-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/880-42-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/848-54-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/2640-58-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/848-44-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/848-49-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/848-54-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/2640-40-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/2640-58-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Loads dropped DLL 2 IoCs

pid	Process
3020	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
3020	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Reads user/profile data of web browsers 2 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

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious use of NtCreateThreadExHideFromDebugger 2 IoCs

pid	Process
3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3020	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 3020 set thread context of 3764	3020	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	91
PID 3764 set thread context of 2640	3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	94
PID 3764 set thread context of 848	3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	95
PID 3764 set thread context of 880	3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	96

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\Computerskrift\Skrabnsers180.Ope72	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.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 5 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	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2640	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
2640	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
880	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
880	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
2640	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
2640	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
3020	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	880	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3020 wrote to memory of 3764	3020	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	91
PID 3020 wrote to memory of 3764	3020	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	91
PID 3020 wrote to memory of 3764	3020	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	91
PID 3020 wrote to memory of 3764	3020	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	91
PID 3020 wrote to memory of 3764	3020	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	91
PID 3764 wrote to memory of 2640	3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	94
PID 3764 wrote to memory of 2640	3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	94
PID 3764 wrote to memory of 2640	3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	94
PID 3764 wrote to memory of 848	3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	95
PID 3764 wrote to memory of 848	3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	95
PID 3764 wrote to memory of 848	3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	95
PID 3764 wrote to memory of 880	3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	96
PID 3764 wrote to memory of 880	3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	96
PID 3764 wrote to memory of 880	3764	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	96

C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
"C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.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:3020
- C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
  "C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:3764
- - C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
    C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe /stext "C:\Users\Admin\AppData\Local\Temp\bwliebxjlvfbaub"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:2640
- - C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
    C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe /stext "C:\Users\Admin\AppData\Local\Temp\lyqbeuikzdxocapnovt"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:848
- - C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
    C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe /stext "C:\Users\Admin\AppData\Local\Temp\wtvtfmsevlptnherxggvdp"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:880

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

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\bwliebxjlvfbaub

Filesize
4KB

MD5
1891919175c888ce82e9bd8a047b01ad

SHA1
502a6892a5d27ecb791ac5aa6d8586944f540453

SHA256
a6c43b4e4b8681cf0ef56c49c730fa77e34dc82db0260253a3ba75039030b9ec

SHA512
8bb940050b1abf6c27db133ed446f41e108f670f361ed5102408832ce33d9b87cd0880723441f1632292eeeb0a319c4e0fac0ea659eb55ebe1130cc3e6c776a3

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsx8DAA.tmp\System.dll

Filesize
11KB

MD5
9625d5b1754bc4ff29281d415d27a0fd

SHA1
80e85afc5cccd4c0a3775edbb90595a1a59f5ce0

SHA256
c2f405d7402f815d0c3fadd9a50f0bbbb1bab9aa38fe347823478a2587299448

SHA512
dce52b640897c2e8dbfd0a1472d5377fa91fb9cf1aeff62604d014bccbe5b56af1378f173132abeb0edd18c225b9f8f5e3d3e72434aed946661e036c779f165b

Download Submit
memory/848-44-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/848-54-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/848-39-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/848-36-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/848-49-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/880-38-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/880-41-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/880-42-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/880-43-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/880-51-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2640-37-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2640-40-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2640-35-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2640-58-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3020-32-0x0000000004F70000-0x0000000007AD0000-memory.dmp

Filesize
43.4MB

Download
memory/3020-28-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/3020-27-0x0000000004F70000-0x0000000007AD0000-memory.dmp

Filesize
43.4MB

Download
memory/3020-26-0x0000000077981000-0x0000000077AA1000-memory.dmp

Filesize
1.1MB

Download
memory/3020-25-0x0000000004F70000-0x0000000007AD0000-memory.dmp

Filesize
43.4MB

Download
memory/3764-30-0x0000000001A60000-0x00000000045C0000-memory.dmp

Filesize
43.4MB

Download
memory/3764-29-0x0000000001A60000-0x00000000045C0000-memory.dmp

Filesize
43.4MB

Download
memory/3764-33-0x0000000001A60000-0x00000000045C0000-memory.dmp

Filesize
43.4MB

Download
memory/3764-60-0x00000000352F0000-0x0000000035309000-memory.dmp

Filesize
100KB

Download
memory/3764-63-0x00000000352F0000-0x0000000035309000-memory.dmp

Filesize
100KB

Download
memory/3764-64-0x00000000352F0000-0x0000000035309000-memory.dmp

Filesize
100KB

Download

Analysis

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