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

Static analysis result for SHA-256 a461fd38a0a97f85…

MALICIOUS

Office (OLE) / .XLS

144.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 6a51646623897738df3c9f68e2f5f179 SHA-1: 02166b7eaeec6c00343f42645659035d121a68e7 SHA-256: a461fd38a0a97f8519fff29e59e1a25095acd55bfff1525863773c348634561d
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The file contains a Workbook_Open VBA macro that utilizes WScript.Shell to execute commands. The macro attempts to construct a path using the 'Templates' special folder and appears to be designed to download and execute a secondary payload. The presence of WScript.Shell and Shell() calls strongly indicates malicious intent for payload delivery.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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
  • 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
b6c793e4f7151a46f75429f791161a1908d73be8617eaddb467853b65685feb0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 34029 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 3 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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