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

Static analysis result for SHA-256 27bab49a0292a7a5…

MALICIOUS

Office (OLE) / .XLS

164.0 KB Created: 2020-03-23 21:31:38 Authoring application: Microsoft Excel
MD5: 6e8bd535be7462c966b7641ec988c397 SHA-1: b0143f09a201e61d4f45b15e4a9c5b8424ca1546 SHA-256: 27bab49a0292a7a5f9ea29486c2b1aae53372a06780aa0d9224757b12630e4d4
260 Risk Score

Malware Insights

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

The critical heuristic OLE_VBA_SHELL indicates a Shell() call within the VBA macros. This is further supported by OLE_VBA_ASC_CHR_SHIFT_SHELL, suggesting a character-shift decoding mechanism is used to obfuscate a Shell command. The Workbook_Open macro (OLE_VBA_WBOPEN) is configured to auto-execute this command upon opening the workbook. The likely intent is to download and execute a second-stage payload.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • VBA character-shift decoded Shell command critical OLE_VBA_ASC_CHR_SHIFT_SHELL
    VBA auto-exec macro stores an encoded command string, decodes it with a Mid/Asc/Chr character-shift loop, and passes the recovered text to Shell. This is a high-confidence command stager.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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
bad3faf83aaa5b74afe19adfafed48a77af972d94f8c00651ddb433e9c18bad5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2719 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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