Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7b545bd95de3a0f6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:20 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 9acf7c8e393c74f49a47c50dfc01cf36 SHA-1: 4614caa090d3d623972f9316acc62be6b439c94f SHA-256: 7b545bd95de3a0f654b9ac38fc4ea6778ea4e1ead1217fe2d7af9888ab2b930f
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 (XLM) macros, specifically triggering an Auto_Open function. This function is known to be used for executing arbitrary commands, often to download and run malicious payloads. The presence of dangerous formula APIs in the Auto_Open macro further indicates 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) 6444 bytes
SHA-256: 89a2a9283c88dbd8da29c1123811f2298ffb436c3dd301185e1ddfd87ba61056
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  EQuSn
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G152 
' 0018     21 LABEL : Cell Value, String Constant - BmqsmN len=0 
' 0018     22 LABEL : Cell Value, String Constant - BSolMoR len=0 
' 0018     27 LABEL : Cell Value, String Constant - ciazOqhnDvRt len=0 
' 0018     20 LABEL : Cell Value, String Constant - COcJW len=0 
' 0018     24 LABEL : Cell Value, String Constant - eaTxvDkzN len=0 
' 0018     25 LABEL : Cell Value, String Constant - eLwhSlSKaA len=0 
' 0018     23 LABEL : Cell Value, String Constant - epGVFVne len=0 
' 0018     25 LABEL : Cell Value, String Constant - FDBPcZnGUZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - fEqYrhhwjAOG len=0 
' 0018     26 LABEL : Cell Value, String Constant - IPHuqPayKSt len=0 
' 0018     25 LABEL : Cell Value, String Constant - IqjJCfheFw len=0 
' 0018     23 LABEL : Cell Value, String Constant - MHcppczB len=0 
' 0018     24 LABEL : Cell Value, String Constant - oDpHjXnNS len=0 
' 0018     20 LABEL : Cell Value, String Constant - rfAFg len=0 
' 0018     24 LABEL : Cell Value, String Constant - RhTqvxhUO len=0 
' 0018     22 LABEL : Cell Value, String Constant - sNfYkpJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - uaErNYYDfU len=0 
' 0018     22 LABEL : Cell Value, String Constant - wPkrjZp len=0 
' 0018     22 LABEL : Cell Value, String Constant - XycSsmY len=0 
' 0018     23 LABEL : Cell Value, String Constant - XYjBpYPy 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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