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

Static analysis result for SHA-256 688f62abf01d9eba…

MALICIOUS

Office (OLE) / .XLS

40.5 KB Created: 2021-09-16 08:03:04 Authoring application: Microsoft Excel
MD5: c3e2b8d3f624a2cc2ae6bf8bff095938 SHA-1: 271fd5dd6edf5e689182c479e658f89e368e8534 SHA-256: 688f62abf01d9eba0c4557f284290a119ee887c1d7f2d5da48014447404cacb9
362 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218.011 System Binary Proxy Execution: Rundll32

The XLS file contains a Workbook_Open macro that executes obfuscated VBA code. This code utilizes WScript.Shell to run a command, likely to download and execute a second-stage payload. The VBA code appears to be attempting to decode a string which is then passed to the Shell() function for execution.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e5defccf76a602179e21a523df193bd20019dde13d3d947417a7ffef0258f251		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7196 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 9 long base64-like blob(s).

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