Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f3915a47c4b2580e…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:45:03 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: a3cbf28b9eeba719a703e802e0cbd67c SHA-1: fbf8f916249213041e714c26437209c5f34d9daa SHA-256: f3915a47c4b2580e2fcf202d1d28df856a0d0ae7873f4dcb367df111160527f2
140 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 critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN further suggests malicious intent. While the exact payload is not clear from the truncated evidence, the mechanism points to a macro-based execution of a second-stage payload.

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) 6702 bytes
SHA-256: 2ce65645c08af5a05610c20d523f8b478d4237c2d353a4d7be455302727a159e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  rYhSvreqdXa
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B156 
' 0018     27 LABEL : Cell Value, String Constant - AZDYWEtJjcXh len=0 
' 0018     26 LABEL : Cell Value, String Constant - CkZTzqPNnjf len=0 
' 0018     27 LABEL : Cell Value, String Constant - DrnpETawRDyl len=0 
' 0018     22 LABEL : Cell Value, String Constant - ENUvTcn len=0 
' 0018     23 LABEL : Cell Value, String Constant - GsXnPeTZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - gzvvpBiWFnxU len=0 
' 0018     21 LABEL : Cell Value, String Constant - IrdUQM len=0 
' 0018     22 LABEL : Cell Value, String Constant - iulPLSU len=0 
' 0018     23 LABEL : Cell Value, String Constant - jdFVIcNW len=0 
' 0018     20 LABEL : Cell Value, String Constant - kbwWW len=0 
' 0018     25 LABEL : Cell Value, String Constant - LrwQereYWM len=0 
' 0018     20 LABEL : Cell Value, String Constant - MBUtr len=0 
' 0018     20 LABEL : Cell Value, String Constant - meyaw len=0 
' 0018     22 LABEL : Cell Value, String Constant - nBLFsdN len=0 
' 0018     26 LABEL : Cell Value, String Constant - oYCrvpUpAOP len=0 
' 0018     26 LABEL : Cell Value, String Constant - rFBREutVxVs len=0 
' 0018     24 LABEL : Cell Value, String Constant - rHOvHFmqG len=0 
' 0018     20 LABEL : Cell Value, String Constant - sagQx len=0 
' 0018     22 LABEL : Cell Value, String Constant - XeIXTcl len=0 
' 0018     25 LABEL : Cell Value, String Constant - YUhRvXIXMJ 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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