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

Static analysis result for SHA-256 100f14bd43501076…

MALICIOUS

Office (OLE) / .XLS

182.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-07-23
MD5: 5c3d66b3f4ec278a92dc1317955207c6 SHA-1: fec09ab5291fc2f0d13ffcd65828fefa130e318e SHA-256: 100f14bd43501076a1b9dc89bdbc702aadbe65054c05e4bdf9ad8f0000d1c699
360 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File T1105 Ingress Tool Transfer

The Excel file contains a Workbook_Open VBA macro that utilizes WScript.Shell to download and execute a second-stage payload. The macro's obfuscated nature and the critical heuristic firings for Shell() calls and HTTP downloads indicate a downloader functionality. The specific URL for the download is not directly visible due to obfuscation, but the intent is clear.

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.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
18dfb4d813b057bbeeb5eb44f2dbf20247dfb49757067c59954e731fe78df484		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 24071 bytes

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