Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7b714ab9347391c3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:35 Authoring application: Microsoft Excel First seen: 2021-09-16
MD5: 7957c30533056ca10e5677488efab6d5 SHA-1: 54ebb273b1e948fdd27a4e0b807a1c9d0f8512d6 SHA-256: 7b714ab9347391c3ebcfa72f3af4bdf00dca997eecf10a91327ae20ca723d72f
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. This indicates the macro sheet is designed to execute automatically upon opening the workbook. The presence of dangerous formula APIs like RUN suggests the macro is intended to execute arbitrary code, likely downloading and running a secondary payload. No specific family could be identified.

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) 6802 bytes
SHA-256: 58cceb0cf9843bdc432faa41d2e8ae93d1d502347718dc9783a1825a10c5a7ac
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, visible -  fQAIkubkW
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E160 
' 0018     27 LABEL : Cell Value, String Constant - BmMgkfbZMTVj len=0 
' 0018     22 LABEL : Cell Value, String Constant - bsLPjHa len=0 
' 0018     23 LABEL : Cell Value, String Constant - cdhqqPPQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - CHcSz len=0 
' 0018     27 LABEL : Cell Value, String Constant - ESOKWcBdELrW len=0 
' 0018     20 LABEL : Cell Value, String Constant - FkBtV len=0 
' 0018     23 LABEL : Cell Value, String Constant - focPgsJC len=0 
' 0018     21 LABEL : Cell Value, String Constant - GcahvP len=0 
' 0018     27 LABEL : Cell Value, String Constant - iFBxrTpzAAEh len=0 
' 0018     23 LABEL : Cell Value, String Constant - iOGZUVYk len=0 
' 0018     25 LABEL : Cell Value, String Constant - KiWjTnLXQa len=0 
' 0018     26 LABEL : Cell Value, String Constant - midWYdTkdWD len=0 
' 0018     21 LABEL : Cell Value, String Constant - mPMwNh len=0 
' 0018     25 LABEL : Cell Value, String Constant - noHwAiLfHk len=0 
' 0018     25 LABEL : Cell Value, String Constant - nTLPZdlUzE len=0 
' 0018     27 LABEL : Cell Value, String Constant - oVZBKWEMkeDn len=0 
' 0018     24 LABEL : Cell Value, String Constant - TMjplPdal len=0 
' 0018     20 LABEL : Cell Value, String Constant - UPNLR len=0 
' 0018     25 LABEL : Cell Value, String Constant - VqfRscnUEb len=0 
' 0018     21 LABEL : Cell Value, String Constant - YMocjM 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
' 00f
... (truncated)

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