Xls.Dropper.Agent-7647675-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 436b4b304f64663b…

MALICIOUS

Office (OLE) / .XLS

31.5 KB Created: 2020-04-03 09:44:34 Authoring application: Microsoft Excel
MD5: d0393f05375d610bb9a3edb4676ec2c0 SHA-1: 0a2b25fec322762b371e430015c39c63db494f7e SHA-256: 436b4b304f64663b2c9aad0371f1b66aee876c12d0841faea3f652ce731f18fb
320 Risk Score

Malware Insights

Xls.Dropper.Agent-7647675-0 · confidence 95%

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

The file is an XLS document containing VBA macros. The Workbook_Open macro is present and uses a character-shift decoder to execute a shell command. This indicates the file is a dropper designed to download and execute a second-stage payload. ClamAV identified the sample as Xls.Dropper.Agent-7647675-0.

Heuristics 7

  • 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.
  • ClamAV: Xls.Dropper.Agent-7647675-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7647675-0
  • 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
817f6d6d6b808e54fc461ab9eca0df934a72b1c9c41a89bb6ab7f97c4ab26311		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2594 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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