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

Static analysis result for SHA-256 31890d2b875b298c…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 63060e6584dcb12881b896c2dc44af6a SHA-1: 3c66f36ad13b5ed9f6dc874adac46aab177da378 SHA-256: 31890d2b875b298c5fa56fdb7d038d85a3864e56f613dff9a66565eb27bc05c3
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is a macro-enabled Excel document containing a Workbook_Open macro that executes a VBScript. The VBScript is designed to download and execute a second-stage payload from multiple URLs, including 'http://midnighsilvercrafters.com/store/wBjNOUwc/BI710N4cQA6R3/' and 'http://temporal.com/NAT_E_05_22_2009/BI710N4cQA6R3/'. It also attempts to save a file to 'c:\programdata\oue4hjld.vbs'. The ClamAV detection 'Doc.Downloader.EmotetRed02220-9938909-0' further supports 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.

FilenameKindSourceSize
macros.bas
7e0a02ef6abe36c8740698a04731c9888d074f190ac0091cfa212fc4fc1bdf4c		 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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