Office (OLE) / .XLSX malware analysis — malicious · d1d75f78093dbc96

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel

MD5: 4df3b1ede77f66c888076f928d358058 SHA-1: 5d231eccde043b2f2d799ff2eabab224928d3630 SHA-256: d1d75f78093dbc96b41a631cf81805ee855a3091bde73cc180b4ed688323814d

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a common delivery mechanism for malware. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://midnighsilevercrafters.com/store/wBjNOUwc/B110N4cA6R3/' and 'https://redington.karmaat', and saves them as 'oue4hjld.vbs' and 'bhnasleil.bat' in the 'c:\programdata\' directory. The ClamAV detection further confirms its malicious nature as a downloader.

Heuristics 6

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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` `7499ee53185ee291a5f51f09adb6806748122fbb845a2aeb8ba5ccbfa96bec0f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	52433 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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