Office (OLE) / .XLSX malware analysis — malicious · e8937b52dfcdad94

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 5b4b0eb38f2c5c4ca261dbfb35641d67 SHA-1: 9f64935f865657653ee6f8885d1a6965300e0afa SHA-256: e8937b52dfcdad94e56b6eca1a7eceee304f5551a6526716c2a712e44db0a95e

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

The sample contains VBA macros that execute upon opening the workbook, as indicated by the Workbook_Open heuristic. The script utilizes Wscript.Shell to create objects and run executables, specifically dropping and executing 'yhjlswle.vbs' and 'ughldskbhn.bat' from the 'c:\programdata\' directory. The script also attempts to download additional content from multiple URLs, including 'http://fulleyness-safety.com/-/P6x/-/', 'https://nabajyotifundation.com/da8uc7jo/4Za/', and others, suggesting a downloader functionality. The ClamAV detection as 'Doc.Downloader.EmotetRed02220-9938909-0' further supports this assessment.

Heuristics 7

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

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
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.
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` `7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12808 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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