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

Static analysis result for SHA-256 9386ccb677bde1c5…

MALICIOUS

Office (OLE) / .XLS

69.5 KB Created: 2022-12-27 08:12:56 First seen: 2022-12-27
MD5: fe6159ef3be1c4ce40e7db9b62d4398c SHA-1: cf258a42fb3f7afe2e3c6a8282ade84a62790fc9 SHA-256: 9386ccb677bde1c51ca3336d02fea66f9489913f2241caa77def71d09464d937
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The XLS file contains VBA macros that utilize `CreateObject` to instantiate `Microsoft.XMLHTTP` and `ADODB.Stream` objects. These objects are used to download a file from a remote source via the `HTML_V_Excel` function and save it to disk using `SaveToFile`. This indicates a downloader functionality, likely to fetch and execute a secondary payload.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • ClamAV: Xls.Downloader.b83ac4c497e169b5-9980307-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.b83ac4c497e169b5-9980307-0
  • 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
d47c11c549e93befac5f0323e84435236abf48c8df536f617f7bb6b080032c85		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4184 bytes

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