MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 741032bb2286b7ef3d963bc4a25d6dc6bd10f58cf589115436ce9e6022603531. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.
Database Entry
GuLoader
Vendor detections: 9
| SHA256 hash: | 741032bb2286b7ef3d963bc4a25d6dc6bd10f58cf589115436ce9e6022603531 |
|---|---|
| SHA3-384 hash: | 18605489b9950b820bb5fba54a4af4d76bc35179342d8b722962a0bd254841447b001f80ea95c064ce2a161ede0c11b5 |
| SHA1 hash: | 6b99ce04e0a7a200c60324a4a763ddf7276a2089 |
| MD5 hash: | fc5a72d2a37fc811d5692f03b3a95f5f |
| humanhash: | bakerloo-ack-victor-equal |
| File name: | fc5a72d2a37fc811d5692f03b3a95f5f.rtf |
| Download: | download sample |
| Signature | GuLoader |
| File size: | 7'463 bytes |
| First seen: | 2020-12-16 08:03:34 UTC |
| Last seen: | 2020-12-16 09:45:39 UTC |
| File type: |  rtf |
| MIME type: | text/rtf |
| ssdeep | 192:r2EceXSdgdJerVarNYF8StRZNsgPrPUnU0UDweqKo0:r2E5XSdgdJerUx3S3ZNsgPUnUfo0 |
| TLSH | 1EF17E6CEC80F6F5AB5A01E54D29BF5C1694307D43E2ADD93ECCCE6E2B262175332454 |
| Reporter |  abuse_ch |
| Tags: | CVE-2017-11882 GuLoader rtf |
Office OLE Information
This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.
OLE dump
Intelligence
File Origin
# of uploads :
2
# of downloads :
303
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Confirm remittance.xlsx
Verdict:
Malicious activity
Analysis date:
2020-12-16 07:50:55 UTC
Tags:
encrypted exploit CVE-2017-11882 loader
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/rtf
Has a screenshot:
False
Contains macros:
False
Result
Verdict:
Malware
Maliciousness:
Behaviour
Launching a process
Creating a window
Creating a file
Sending an HTTP GET request
Launching a file downloaded from the Internet
Creating a process from a recently created file
Result
Verdict:
Malicious
File Type:
RTF File
Result
Verdict:
MALICIOUS
Result
Threat name:
GuLoader
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Signature
Detected RDTSC dummy instruction sequence (likely for instruction hammering)
Drops PE files to the user root directory
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Office equation editor drops PE file
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Sigma detected: Droppers Exploiting CVE-2017-11882
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: Executables Started in Suspicious Folder
Sigma detected: Execution in Non-Executable Folder
Sigma detected: File Dropped By EQNEDT32EXE
Sigma detected: Suspicious Program Location Process Starts
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to detect virtualization through RDTSC time measurements
Yara detected GuLoader
Yara detected VB6 Downloader Generic
Behaviour
Behavior Graph:
Threat name:
Document-Office.Exploit.CVE-2017-11882
Status:
Malicious
First seen:
2020-12-16 08:04:06 UTC
AV detection:
12 of 29 (41.38%)
Threat level:
5/5
Result
Malware family:
n/a
Score:
8/10
Tags:
n/a
Behaviour
Launches Equation Editor
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Checks processor information in registry
Enumerates system info in registry
Office loads VBA resources, possible macro or embedded object present
Drops file in Windows directory
Loads dropped DLL
Uses the VBS compiler for execution
Blocklisted process makes network request
Executes dropped EXE
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
YARA Signatures
MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.
| Rule name: | Email_stealer_bin_mem |
|---|---|
| Author: | James_inthe_box |
| Description: | Email in files like avemaria |
| Rule name: | INDICATOR_RTF_EXPLOIT_CVE_2017_11882_4 |
|---|---|
| Author: | ditekSHen |
| Description: | detects RTF variant documents potentially exploiting CVE-2018-0802 or CVE-2017-11882 |
| Rule name: | INDICATOR_RTF_MalVer_Objects |
|---|---|
| Author: | ditekSHen |
| Description: | Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents. |
| Rule name: | IPPort_combo_mem |
|---|---|
| Author: | James_inthe_box |
| Description: | IP and port combo |
| Rule name: | Select_from_enumeration |
|---|---|
| Author: | James_inthe_box |
| Description: | IP and port combo |
| Rule name: | SharedStrings |
|---|---|
| Author: | Katie Kleemola |
| Description: | Internal names found in LURK0/CCTV0 samples |
| Rule name: | UAC_bypass_bin_mem |
|---|---|
| Author: | James_inthe_box |
| Description: | UAC bypass in files like avemaria |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
Web download
Delivery method
Distributed via web download
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