Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 eb5b61b197c89ba6…

MALICIOUS

Office (OLE)

711.5 KB Created: 2021-07-14 08:38:23 Authoring application: Microsoft Excel
MD5: 73f2506109fae384bc40c7ba7cb5fc9c SHA-1: 58785bf67005c615296afc31ead5319c6f119b8d SHA-256: eb5b61b197c89ba6a19d3eaeda56d858f6bd30beaff0a43719fc5c6591e7ad2d
416 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218.005 Signed Binary Proxy Execution: Mshta

The sample is an Excel document containing a Workbook_Open VBA macro. This macro iterates through cells in Sheet1, concatenates their values into a string, writes this string to a file named 'qLegendPositionTop.sct' in the ALLUSERSPROFILE directory, and then executes this script using mshta.exe. The 'SE_INVOICE_LURE' heuristic and the document body suggest a fake invoice lure to trick the user into opening the malicious document. The script execution via mshta.exe is a common technique for downloading and executing further malicious payloads.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Reference to mshta.exe high SC_STR_MSHTA
    Reference to mshta.exe
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0ad7ada236d7a38422d29a09b9bf0cba3160da4edfbd1223d7c0f3d8e4924322		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1255 bytes

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