Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0578a01457ba5834…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:47:20 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 3ee1b3c45d4707bf284d06c0df2bc99a SHA-1: 5bb83907baa29ad67f15c9a50a9aee884e6d149c SHA-256: 0578a01457ba5834bc232837f35863886cd399e759b32b8513458206a8ed87ea
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 known method for executing malicious code. The macro sheet contains a call to a dangerous function (risky-formula=3; RUN=0), strongly suggesting it is designed to download and execute a secondary payload. No specific family could be identified from the available 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) 6678 bytes
SHA-256: a8846f1c42b8cd7b8e79ac92aec920212440dbc97f01b1ff60c81f0510e040b2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  YisPUpLnso
' 0018     25 LABEL : Cell Value, String Constant - AnCSJHVCXe len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E185 
' 0018     26 LABEL : Cell Value, String Constant - CcKihuSaExl len=0 
' 0018     25 LABEL : Cell Value, String Constant - cytjKAFvUN len=0 
' 0018     25 LABEL : Cell Value, String Constant - EjrMsvIiwn len=0 
' 0018     26 LABEL : Cell Value, String Constant - fcTxiFsuuDi len=0 
' 0018     27 LABEL : Cell Value, String Constant - fJYRTWIsvSMz len=0 
' 0018     24 LABEL : Cell Value, String Constant - kecDJJVMJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - KQYeKNdvWiPy len=0 
' 0018     20 LABEL : Cell Value, String Constant - kRRDl len=0 
' 0018     26 LABEL : Cell Value, String Constant - MgnyTWGNzso len=0 
' 0018     26 LABEL : Cell Value, String Constant - mGQmWYKHzHM len=0 
' 0018     26 LABEL : Cell Value, String Constant - NHDTzbnPFnm len=0 
' 0018     26 LABEL : Cell Value, String Constant - oUdYhuMQfYj len=0 
' 0018     20 LABEL : Cell Value, String Constant - RLGAz len=0 
' 0018     20 LABEL : Cell Value, String Constant - SVbPD len=0 
' 0018     27 LABEL : Cell Value, String Constant - TyKtyYVXlOzv len=0 
' 0018     20 LABEL : Cell Value, String Constant - umUqy len=0 
' 0018     25 LABEL : Cell Value, String Constant - WqImBecYTz len=0 
' 0018     27 LABEL : Cell Value, String Constant - zUDyvspziUph len=0 
' 0018     24 LABEL : Cell Value, String Constant - zUKSERSOx 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, Strin
... (truncated)

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