Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 d0b9b64cf8fff296…

MALICIOUS

Office (OOXML) / .XLSM

208.8 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300
MD5: eea056e9b9346f7deccb0024f2abc92c SHA-1: 41cc4e180579de153f2473fe2cfca4bc09d0f551 SHA-256: d0b9b64cf8fff296e07d652eaf1a0295d707611c0d96d210f0540d882d8054e5
182 Risk Score

Malware Insights

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

The sample is an XLSM file containing VBA macros, specifically a Workbook_Open macro that executes a PowerShell command. This command reconstructs and executes a PowerShell script from concatenated strings, which in turn downloads a file named 'prod.vbs' to the user's temporary directory and executes it. The script also attempts to download a payload from 'http://evil.evidencero.com/download/dic?diser=...&keyhtua=...'. The use of Workbook_Open and CreateObject indicates a malicious intent to execute arbitrary code upon opening the document.

Heuristics 6

  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • 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 project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7aaa3a1061320a02110ec3a83c6e2d6b5cbc83ffb22220122a04b8808d8c1a64		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1238 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
a04065f3810b3a0828fbbf1605af423e02ec3a7d99fc0b90afb63b55c9b87acc		 vba-project OOXML VBA project: xl/vbaProject.bin 14848 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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