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

Static analysis result for SHA-256 2462cac7c8d32602…

MALICIOUS

Office (OLE) / .XLSX

69.0 KB Created: 2022-11-08 07:31:36 Authoring application: Microsoft Excel First seen: 2022-11-09
MD5: b11cb164bedcf34f18bd1d2e157008ee SHA-1: 17be8de831683218ebe4ffd06f6a1b9a22f07fd2 SHA-256: 2462cac7c8d32602c59e9e2ed8194b71dd2be8e660b4de95079f5d95d8d34ded
288 Risk Score

Malware Insights

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

The file contains VBA macros that utilize WScript.Shell and CreateObject to download a payload from a remote URL. The `cominciarono` function appears to construct a URL using obfuscated strings and then fetches content from it. This indicates a downloader functionality, likely to fetch and execute a second-stage malicious file.

Heuristics 7

  • 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.d795e45a60a593c6-9978800-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.d795e45a60a593c6-9978800-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2234935f9bddd4be0e4ed5b6361457f1f36b4e63171fda7d448245ec2421ccd6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3823 bytes

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