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

Static analysis result for SHA-256 037b6ead02822517…

MALICIOUS

Office (OLE) / .XLSX

88.5 KB Created: 2022-02-14 05:58:53 Authoring application: Microsoft Excel First seen: 2022-03-02
MD5: 24db59609b58200bf4dccc27fd3e83a4 SHA-1: df1f218d28c515c110aa34b97dceb27cece2ef55 SHA-256: 037b6ead02822517a347554d0877e4d80f44ffb51bf5faf85cbc122bb9070d85
240 Risk Score

Malware Insights

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

The file contains a Workbook_Open VBA macro that executes obfuscated PowerShell commands. These commands appear to download and execute a second-stage payload from a hardcoded URL, indicated by the reconstructed string 'http:http://1566xuesuiwhe.comdhjwuiwp-incuiwludesdhjz92ZVqHH8dhjbouhtuiwtuiwp:dhjdhjmyuiwmicrog'. The presence of CreateObject and WScript references further supports the execution of external scripts. The ClamAV detection name 'Doc.Downloader.Emotet02220-9940037-0' suggests a downloader functionality, likely Emotet, though the family is not definitively confirmed.

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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