Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bdb62eafbde778bb…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:15 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: 814ed4b755ce9c5346d281c2a64581d8 SHA-1: 75b8ed0b2ef7ba537a977db83944f75ebfe4dc79 SHA-256: bdb62eafbde778bb877ba6ebb9ae4e1049fb926b4ea94d5d066abe261169c790
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 function, which is a known method for executing malicious code. The macro sheet contains a defined name 'Auto_Open', suggesting it will automatically run upon opening the workbook. This technique is commonly used to download and execute a second-stage payload.

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) 6511 bytes
SHA-256: be298995edefece3884329a1182fc0836a1ccd467167ce9625896433e8cd4d2a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  AXHRpf
' 0018     23 LABEL : Cell Value, String Constant - aHETdHaq len=0 
' 0018     22 LABEL : Cell Value, String Constant - aIgXLxT len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E159 
' 0018     27 LABEL : Cell Value, String Constant - caCICXIEXMjJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - ddKDZtOAEv len=0 
' 0018     20 LABEL : Cell Value, String Constant - dKWtx len=0 
' 0018     27 LABEL : Cell Value, String Constant - FHowSeYNEfdx len=0 
' 0018     25 LABEL : Cell Value, String Constant - FJUEplafeG len=0 
' 0018     21 LABEL : Cell Value, String Constant - GhHWOb len=0 
' 0018     20 LABEL : Cell Value, String Constant - JNdEZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - JZCEZaV len=0 
' 0018     26 LABEL : Cell Value, String Constant - kTCxfsudDnL len=0 
' 0018     26 LABEL : Cell Value, String Constant - mQMaeNicPDp len=0 
' 0018     26 LABEL : Cell Value, String Constant - nrpdoIqGuBO len=0 
' 0018     22 LABEL : Cell Value, String Constant - oaxtTdj len=0 
' 0018     26 LABEL : Cell Value, String Constant - qiAlRCFXdfT len=0 
' 0018     27 LABEL : Cell Value, String Constant - rLTkOyEuVyIM len=0 
' 0018     21 LABEL : Cell Value, String Constant - UBBNVj len=0 
' 0018     21 LABEL : Cell Value, String Constant - xHIlne len=0 
' 0018     20 LABEL : Cell Value, String Constant - XVKyA len=0 
' 0018     20 LABEL : Cell Value, String Constant - YicJl 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
... (truncated)

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