Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 68a7d1fcdbcacf66…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:42:33 Authoring application: Microsoft Excel First seen: 2021-10-02
MD5: 9075534b7fd5573c85956127c30cbf6a SHA-1: 09e219f14326f7fb0d8e29eeb6290fcf54142caf SHA-256: 68a7d1fcdbcacf669ceeb37c48cbe409e447e24aa77a42051b47e3905341e4af
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a common technique for executing malicious code upon opening the document. The `RUN=0` value associated with the dangerous formula API suggests the macro is designed to directly execute a payload. No specific family could be identified, and no URLs or further script content were extracted to provide additional IOCs.

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) 6631 bytes
SHA-256: 92ab590c702ef9207cb59cdb5eb32b594cd86b9afd7cc1ebabf0f347c84a57ad
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 -  QqIgxkX
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I166 
' 0018     26 LABEL : Cell Value, String Constant - bjWwrGQxHPk len=0 
' 0018     22 LABEL : Cell Value, String Constant - FlOhJaM len=0 
' 0018     23 LABEL : Cell Value, String Constant - FZlPTouY len=0 
' 0018     25 LABEL : Cell Value, String Constant - IXrqHrHhvJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - kLnfk len=0 
' 0018     26 LABEL : Cell Value, String Constant - LkuNVaxbFnW len=0 
' 0018     22 LABEL : Cell Value, String Constant - LXZvoqi len=0 
' 0018     25 LABEL : Cell Value, String Constant - MFdVgpLeMu len=0 
' 0018     20 LABEL : Cell Value, String Constant - mYlCd len=0 
' 0018     21 LABEL : Cell Value, String Constant - nAKJGb len=0 
' 0018     26 LABEL : Cell Value, String Constant - NhxJmcBtipp len=0 
' 0018     25 LABEL : Cell Value, String Constant - NpkjnRLGBr len=0 
' 0018     26 LABEL : Cell Value, String Constant - nuyuDnIIqFN len=0 
' 0018     20 LABEL : Cell Value, String Constant - NxDaF len=0 
' 0018     25 LABEL : Cell Value, String Constant - qAgJwGYArc len=0 
' 0018     24 LABEL : Cell Value, String Constant - SXQsQSKJi len=0 
' 0018     27 LABEL : Cell Value, String Constant - WZQfJmSshTdM len=0 
' 0018     26 LABEL : Cell Value, String Constant - YeuyjxENPmM len=0 
' 0018     20 LABEL : Cell Value, String Constant - YgRxo len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZqAVZfsTE 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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