Conti — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 4b2862a1665a6270…

MALICIOUS

Office (OLE) / .XLS

249.0 KB Created: 2021-11-01 06:15:30 Authoring application: Microsoft Excel First seen: 2022-03-15
MD5: 6cef87a6ffb254bfeb61372d24e1970a SHA-1: e21d95b648944ad2287c6bc01fcc12b05530e455 SHA-256: 4b2862a1665a62706f88304406b071a5c9a6b3093daadc073e174ac6d493f26c
288 Risk Score

Malware Insights

Conti · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1566.002 Spearphishing Attachment

The file is an Excel XLS document containing a Workbook_Open VBA macro, which is a common delivery mechanism for malware. The macro uses CreateObject and CallByName, indicating dynamic code execution. The ClamAV detection name 'Xls.Dropper.Conti-9937576-0' strongly suggests the Conti ransomware family. The VBA code itself is obfuscated but the presence of auto-execution and object creation points to a downloader or dropper functionality.

Heuristics 8

  • ClamAV: Xls.Dropper.Conti-9937576-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Conti-9937576-0
  • 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
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7ad922d13e5a422925abe8f7a025f94984a1f77f8eab07dc452c09f3c89ac8a5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6837 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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