Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0b1a4a0c451e3527…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:04 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 363c59e6874ab86a975700e782c58589 SHA-1: 7649a2f6b8e776f4bcc3c614adb17358876959e3 SHA-256: 0b1a4a0c451e35270518a846aa28f0b11b507910e133ab3251b0830f697f2a04
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros, specifically an Auto_Open macro. This indicates an attempt to automatically execute code upon opening the document. The presence of dangerous formula APIs like RUN suggests the macro is designed to download and execute a secondary payload, a common technique for malware delivery.

Heuristics 3

  • 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.

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) 6392 bytes
SHA-256: 7b91e788ca2391d688deb3215edffe92fce6e4fce5911bd6cbbb618e2c650d09
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  hxQU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G143 
' 0018     27 LABEL : Cell Value, String Constant - awDHOtjIQVun len=0 
' 0018     20 LABEL : Cell Value, String Constant - BBFTq len=0 
' 0018     23 LABEL : Cell Value, String Constant - btIsPKMj len=0 
' 0018     21 LABEL : Cell Value, String Constant - CpHpKq len=0 
' 0018     25 LABEL : Cell Value, String Constant - dUbmUsMmcq len=0 
' 0018     23 LABEL : Cell Value, String Constant - eQXgGWNF len=0 
' 0018     27 LABEL : Cell Value, String Constant - GagyquYVMvui len=0 
' 0018     20 LABEL : Cell Value, String Constant - gMbFz len=0 
' 0018     22 LABEL : Cell Value, String Constant - jCamwSn len=0 
' 0018     22 LABEL : Cell Value, String Constant - JlIDrgj len=0 
' 0018     27 LABEL : Cell Value, String Constant - JokLNKacroYo len=0 
' 0018     20 LABEL : Cell Value, String Constant - PDsbh len=0 
' 0018     27 LABEL : Cell Value, String Constant - qcYDlFCILviT len=0 
' 0018     20 LABEL : Cell Value, String Constant - rSSJj len=0 
' 0018     25 LABEL : Cell Value, String Constant - SthVmUmMmW len=0 
' 0018     27 LABEL : Cell Value, String Constant - uHTdbCSTjGLy len=0 
' 0018     22 LABEL : Cell Value, String Constant - WOcHFWh len=0 
' 0018     21 LABEL : Cell Value, String Constant - xjaycw len=0 
' 0018     27 LABEL : Cell Value, String Constant - YBqRkxtthUwy len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZqhFwfcfbx len=0 
' 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
' 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
' 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
' 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     
... (truncated)

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