Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e526a4982c5d46e7…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:31 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: b69a47bb0111f0e001b9851a8a669427 SHA-1: 386853fd9d6ec1deb5bafdb8a6c60ecfd52d6196 SHA-256: e526a4982c5d46e7be3e7375b96900ea7028f2f239e8919cc049d818f1ea3c16
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 suggests the macro is designed to execute arbitrary code. This pattern is commonly used to download and execute further malicious payloads.

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) 6807 bytes
SHA-256: a8b326d7a1bbff9ac73e76d1bcaa1a605796850357ed8df7a4b63de6659cf662
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Zrywfhj
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H142 
' 0018     25 LABEL : Cell Value, String Constant - dDvMcovEHG len=0 
' 0018     26 LABEL : Cell Value, String Constant - GdgKnYopMWO len=0 
' 0018     27 LABEL : Cell Value, String Constant - GOdaFspDFaMl len=0 
' 0018     26 LABEL : Cell Value, String Constant - GvLBNJXYIkt len=0 
' 0018     24 LABEL : Cell Value, String Constant - GxORMiYoh len=0 
' 0018     27 LABEL : Cell Value, String Constant - iRoHPhhQBIVg len=0 
' 0018     26 LABEL : Cell Value, String Constant - jbPuWsHnIrM len=0 
' 0018     20 LABEL : Cell Value, String Constant - LBJbY len=0 
' 0018     26 LABEL : Cell Value, String Constant - lxXBkEpxzOp len=0 
' 0018     27 LABEL : Cell Value, String Constant - mxhIIPTkusFE len=0 
' 0018     25 LABEL : Cell Value, String Constant - pfocBGmqoR len=0 
' 0018     25 LABEL : Cell Value, String Constant - qIQXUkbeYY len=0 
' 0018     22 LABEL : Cell Value, String Constant - QWwAmta len=0 
' 0018     21 LABEL : Cell Value, String Constant - SCjgja len=0 
' 0018     24 LABEL : Cell Value, String Constant - VPelZJKer len=0 
' 0018     26 LABEL : Cell Value, String Constant - wnbXWqSnHOJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - yATVgC len=0 
' 0018     27 LABEL : Cell Value, String Constant - YKgktIiAAkrs len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZBKRRi len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZpxSI 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 Constan
... (truncated)

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