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

Static analysis result for SHA-256 1c6ef06f48256543…

MALICIOUS

Office (OLE) / .XLS

31.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 516c0881dbab3d30b04cfb66d1d74825 SHA-1: 7066030e83be93ecddd7f7bb84100077bd678ef7 SHA-256: 1c6ef06f48256543d9fc81199af54025a42a20bf01a2eedd49b85d2c1f580541
380 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel file with a high confidence verdict of malicious. It contains VBA macros, including an Auto_Close macro that utilizes Shell() and WScript.Shell, indicating it is designed to execute arbitrary code. The ClamAV detection name 'Xls.Downloader.Aggah-7677882-0' and the presence of a 'macros.bas' artifact further support its role as a downloader. The VBA macros likely download and execute a second-stage payload.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Downloader.Aggah-7677882-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Aggah-7677882-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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 medium 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
2bea6860c2f0cdb515f8f74ae66727c544efb55c28cc1ce9983ae704d41da81b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1777 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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