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

Static analysis result for SHA-256 86f7c12724caf5b2…

MALICIOUS

Office (OLE) / .XLS

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 841d5b878b8203c4caa9ea7c2e52bfd3 SHA-1: f674340cd5cf02b43e8b26589856d9aa67a5a6d2 SHA-256: 86f7c12724caf5b2a5e5557285a68d3fca3fe919a32095de33b295d9f122fd41
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The file contains VBA macros that are automatically executed upon opening the workbook, indicated by the Workbook_Open heuristic. The script uses Wscript.Shell to create objects and execute commands. It attempts to download and run a VBS file from 'c:\programdata\yhjlswle.vbs' and a BAT file from 'c:\programdata\ughldskbhn.bat'. The script also contains a heavily obfuscated string that appears to be a list of URLs, likely for downloading additional payloads. The ClamAV detection 'Doc.Downloader.EmotetRed02220-9938909-0' further supports its malicious nature as a downloader.

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.

FilenameKindSourceSize
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.

Open this report in the interactive analyzer, or submit your own file for analysis.