Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 06da531847f7c174…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:07 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: dbc3071bb62191f5b5d9859fa6793842 SHA-1: 914e4d5dc1787c7fabefb6ce99af78bc6bca006a SHA-256: 06da531847f7c174cc0dceef4a3d82d15ac878c1cf170dd7a42675d5c21284a0
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet containing an Auto_Open function, which is a critical finding indicating potential for arbitrary code execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet is likely designed to download and execute a second-stage payload, although the specific payload and its destination are not discernible from the provided evidence.

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) 6537 bytes
SHA-256: 16f777b09ee0fa3a3095e9ff69309919ce7758b7e1110297fe8434fd648ed4ed
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  syHsiF
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C194 
' 0018     24 LABEL : Cell Value, String Constant - ccfRevPpP len=0 
' 0018     23 LABEL : Cell Value, String Constant - DtAimdvK len=0 
' 0018     21 LABEL : Cell Value, String Constant - GAUIkV len=0 
' 0018     23 LABEL : Cell Value, String Constant - ghzOsTsC len=0 
' 0018     27 LABEL : Cell Value, String Constant - gzTDzePDsLFN len=0 
' 0018     20 LABEL : Cell Value, String Constant - LyZvK len=0 
' 0018     24 LABEL : Cell Value, String Constant - MORtESzmX len=0 
' 0018     23 LABEL : Cell Value, String Constant - MSCemWlp len=0 
' 0018     27 LABEL : Cell Value, String Constant - niIDhvdEaWGB len=0 
' 0018     24 LABEL : Cell Value, String Constant - nMzBLsAyZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - oGOwDYWYlpFU len=0 
' 0018     22 LABEL : Cell Value, String Constant - OnPFDDf len=0 
' 0018     26 LABEL : Cell Value, String Constant - QXDvbsdsHgd len=0 
' 0018     22 LABEL : Cell Value, String Constant - rmzXOve len=0 
' 0018     22 LABEL : Cell Value, String Constant - RYwVRmM len=0 
' 0018     22 LABEL : Cell Value, String Constant - sktfAqX len=0 
' 0018     25 LABEL : Cell Value, String Constant - txFGGRBqPc len=0 
' 0018     24 LABEL : Cell Value, String Constant - UZexpaXhN len=0 
' 0018     27 LABEL : Cell Value, String Constant - WHNbknsRivwa len=0 
' 0018     21 LABEL : Cell Value, String Constant - zVYwxb 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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