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

Static analysis result for SHA-256 8d5de0e3008681d6…

MALICIOUS

Office (OLE) / .XLS

247.0 KB Created: 2019-05-10 07:57:09 First seen: 2022-04-20
MD5: d0e4d238c4251157a45f673baa1a1491 SHA-1: 7c2ce0ab83eb9bd34e29990ebfa4cb2f9a335c8d SHA-256: 8d5de0e3008681d6c9ba4a3bc5285bc967cce3b7f81c08e2a65112c76eea7d6a
448 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The file contains VBA macros, specifically a Workbook_Open macro, which is a common technique for initial execution. The script utilizes WScript.Shell and the Shell() function to download and execute a second-stage payload. The exact nature of the payload is obfuscated, but the presence of these execution functions and the ClamAV detection strongly indicate a downloader functionality. No specific family could be confidently identified due to the obfuscation.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Downloader.Generic-6923172-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Generic-6923172-0
  • 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
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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
cf956950572b8efdceb7c6a78a091b0cbafb7358d08dce0440189582babc87ac		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 113299 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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