Office (OLE) / .XLS malware analysis — malicious · b038873608088e7d

MALICIOUS

Office (OLE) / .XLS

306.0 KB Created: 2020-11-19 00:20:37

MD5: 233e6cecdf2f1995262c068348f37c3f SHA-1: 4b9b8f2b5d0bbe7aabfaca08a6518cdeee00ed6e SHA-256: b038873608088e7d9f054df77e88fa0b9ada18062e5977f57b5278755735cb73

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The critical OLE_VBA_SHELL and OLE_VBA_DOWNLOAD heuristics indicate that the VBA macros within this XLS file are designed to execute commands and download additional content. Specifically, the Workbook_Open macro is triggered upon opening, which is a common technique for initiating malicious actions. The extracted artifact 'macros.bas' likely contains the VBA code responsible for these actions, aiming to download and execute a second-stage payload.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `84e69112930ceffa0d0e6c669060b17e38bb2ffacac9621dc6e158cd7172a80a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3414 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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