Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7e456bbdb4c1813a…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:11 Authoring application: Microsoft Excel First seen: 2021-09-29
MD5: c61c5122e49984f7fc2b0350755a2cd8 SHA-1: 9756d8025b6845b9a61eb38bcc9cf6cac8efe71f SHA-256: 7e456bbdb4c1813ab87e029d0ca8c1ff39ebf7f0829af56e1105149f7ddd4e09
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 entry, which is a known technique for executing malicious code. The macro sheet contains a reference to 'Auto_Open', suggesting it will run automatically upon opening the workbook. This functionality is typically used to download and execute further stages of malware.

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) 6665 bytes
SHA-256: 9ca932bb2678ba136a546eb1b535bbffa34157c697b33a06f3067412195614a7
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 -  GmN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D179 
' 0018     26 LABEL : Cell Value, String Constant - EoagokewmKz len=0 
' 0018     21 LABEL : Cell Value, String Constant - fNpjCC len=0 
' 0018     27 LABEL : Cell Value, String Constant - GVaWbSRrCWgZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - gviHC len=0 
' 0018     21 LABEL : Cell Value, String Constant - IAQqJZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - jhyCabED len=0 
' 0018     22 LABEL : Cell Value, String Constant - JuDLnGJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - obTBrNnc len=0 
' 0018     22 LABEL : Cell Value, String Constant - OjNHuwy len=0 
' 0018     23 LABEL : Cell Value, String Constant - ooDZgUpI len=0 
' 0018     27 LABEL : Cell Value, String Constant - pbuTmpPeMLhy len=0 
' 0018     25 LABEL : Cell Value, String Constant - rVrNUnVXng len=0 
' 0018     20 LABEL : Cell Value, String Constant - stFvX len=0 
' 0018     22 LABEL : Cell Value, String Constant - suivord len=0 
' 0018     25 LABEL : Cell Value, String Constant - tPHmcvheUe len=0 
' 0018     22 LABEL : Cell Value, String Constant - uodeIgv len=0 
' 0018     22 LABEL : Cell Value, String Constant - wEDVvHa len=0 
' 0018     21 LABEL : Cell Value, String Constant - WVSPHa len=0 
' 0018     25 LABEL : Cell Value, String Constant - YxFjnkwnIO len=0 
' 0018     26 LABEL : Cell Value, String Constant - zbGvOSdWBmr 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 LABELS
... (truncated)

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