Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 96e4b4325f6b0f4f…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:33:02 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 3eee258ebd9a60149cd2ce8d0dc41aeb SHA-1: 73ba62d74d9115259d751f9d84bcd80792af3991 SHA-256: 96e4b4325f6b0f4fd36845240d3987c7b98efa3cd714034ec099c28e0119f187
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open defined name, which is a known technique for executing malicious code upon opening. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it's designed to run arbitrary commands or download further payloads. No specific IOCs like URLs or hashes were extracted, but the technique itself is highly indicative of malicious intent.

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) 6335 bytes
SHA-256: e333d8fba4939356e8a084364da0f52880394174d530e6ffd25ddf9cfbb14d91
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  yuM
' 0018     22 LABEL : Cell Value, String Constant - AGaoNMY len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E149 
' 0018     22 LABEL : Cell Value, String Constant - CXVoCGi len=0 
' 0018     20 LABEL : Cell Value, String Constant - DhVow len=0 
' 0018     23 LABEL : Cell Value, String Constant - DyzNPtBm len=0 
' 0018     26 LABEL : Cell Value, String Constant - hFJbbRyFdQA len=0 
' 0018     26 LABEL : Cell Value, String Constant - IecCQrcIfxK len=0 
' 0018     23 LABEL : Cell Value, String Constant - ikWNqJQE len=0 
' 0018     22 LABEL : Cell Value, String Constant - jXyEtVS len=0 
' 0018     26 LABEL : Cell Value, String Constant - KckmlGeBkjG len=0 
' 0018     24 LABEL : Cell Value, String Constant - lhOYhbDow len=0 
' 0018     20 LABEL : Cell Value, String Constant - mRpVo len=0 
' 0018     22 LABEL : Cell Value, String Constant - nDekShR len=0 
' 0018     21 LABEL : Cell Value, String Constant - sgNthR len=0 
' 0018     25 LABEL : Cell Value, String Constant - SrEANjChOs len=0 
' 0018     21 LABEL : Cell Value, String Constant - TYkjjh len=0 
' 0018     21 LABEL : Cell Value, String Constant - TZCpwn len=0 
' 0018     23 LABEL : Cell Value, String Constant - uwLAHvOy len=0 
' 0018     26 LABEL : Cell Value, String Constant - WOtOUdqvxRF len=0 
' 0018     20 LABEL : Cell Value, String Constant - wUCzt len=0 
' 0018     27 LABEL : Cell Value, String Constant - xeUHBtzXxime 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     10 LABELSST 
... (truncated)

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