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

Static analysis result for SHA-256 be9786f7969d057a…

MALICIOUS

Office (OLE) / .XLS

60.0 KB Created: 2021-03-05 06:43:07 Authoring application: Microsoft Excel
MD5: 31598d180570ccc3b82879c7abb5ae24 SHA-1: af5451b3eaa955073ea4a1f7ab097cdd2067afd9 SHA-256: be9786f7969d057aefa9385b4b08a6c3bbd99664a266b09eec6d30db38c11d37
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.003 Windows Command Shell

The sample is a Microsoft Excel file containing VBA macros, specifically a Workbook_Open macro that utilizes WScript.Shell and CreateObject. This indicates the macro attempts to execute commands or scripts on the host system. The document body's prompt to 'enable content' is a common lure for users to bypass macro security warnings, facilitating the execution of the malicious payload.

Heuristics 8

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a297489b1263c4d1bb4ab2cc0bf3b5baff52f798520720ad4f98885a0734020d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 37776 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 111 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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