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

Static analysis result for SHA-256 aee3928ee6e2d759…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 83847185a8216438795cf7cf47bb350f SHA-1: ec5f72151456d8f24f0a55648fa912e263503fea SHA-256: aee3928ee6e2d75996b115d3eab8c4074f88ef837a8a07878082bd2c11269ab0
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

This XLSX file contains VBA macros that execute upon opening the workbook. The macros leverage `CreateObject` to instantiate `Wscript.Shell` and `RDS.DataSpace`, indicating an intent to run external commands or scripts. The `Workbook_Open` subroutine is triggered, and the script attempts to construct and execute commands, including downloading payloads from multiple URLs. The presence of `Wscript.Shell` and the construction of batch commands strongly suggest the execution of a second-stage payload. The `c:\programdata\uidpjewl.bat` file and the reconstructed URL `http://lbsbriegfs.com/cgi/2kl8X826xEKuehUI/` are key indicators of this malicious activity.

Heuristics 7

  • ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
  • 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.

FilenameKindSourceSize
macros.bas
faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13985 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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