Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 6ad8013c03d6c423…

MALICIOUS

Office (OLE) / .XLSX

88.5 KB Created: 2022-02-14 05:58:53 Authoring application: Microsoft Excel First seen: 2022-02-22
MD5: a7d60c1bc0697ccda32ed343abac7cc6 SHA-1: 6057d5e8ba5dd3d51cd59c14ec145364074df99e SHA-256: 6ad8013c03d6c4238bf38853e71907ad2d1a12b4e699adf803e0cba9822a903f
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains a Workbook_Open VBA macro that utilizes CreateObject to execute obfuscated PowerShell commands. These commands are designed to download and execute a second-stage payload from a series of URLs, including 'http://wiw.ama.judpr.zadhj-GBGJeFxXWlNbABv2' and 'http://my.microg.com/infom4mgt2MeU'. The presence of the Workbook_Open macro and the obfuscated PowerShell execution strongly suggests a downloader or droppper functionality, characteristic of Emotet. The file was detected by ClamAV as 'Doc.Downloader.Emotet02220-9940037-0'.

Heuristics 6

  • ClamAV: Doc.Downloader.Emotet02220-9940037-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet02220-9940037-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
98ce64e756a4ee3d4f776c1541f7f3ad0f966d786db88eda74f9a833f3a74b83		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 11705 bytes

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