Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 30db01c0e7df5a1c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:28 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 4db0072e1416fe3af8d606a67884a6d0 SHA-1: 69dc56f6a86a69cc9dc0da5aa75ec90a56884964 SHA-256: 30db01c0e7df5a1c5b4160709e5520f213b549715e3fc8d9f18ad472ed580b73
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open defined name, which is a common technique for executing malicious code upon opening. The presence of dangerous formula APIs in the Auto_Open function further increases the risk. While the specific payload is not immediately clear from the static analysis, the mechanism strongly suggests an attempt to execute arbitrary code.

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) 6603 bytes
SHA-256: 9e2f6b5e2aab439400f75d6b9dc4d8ce7be39c47d95569f3a4e3c2866a8e7ad1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  NOdV
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A154 
' 0018     25 LABEL : Cell Value, String Constant - cJSkgxyKiL len=0 
' 0018     20 LABEL : Cell Value, String Constant - cNOxO len=0 
' 0018     21 LABEL : Cell Value, String Constant - dCReDC len=0 
' 0018     26 LABEL : Cell Value, String Constant - Dgworznvjpd len=0 
' 0018     25 LABEL : Cell Value, String Constant - etWLOdduds len=0 
' 0018     24 LABEL : Cell Value, String Constant - HdlrfDrIs len=0 
' 0018     24 LABEL : Cell Value, String Constant - iuMGuAXfx len=0 
' 0018     22 LABEL : Cell Value, String Constant - jpjxUat len=0 
' 0018     20 LABEL : Cell Value, String Constant - kitKd len=0 
' 0018     23 LABEL : Cell Value, String Constant - NeGnLxfH len=0 
' 0018     27 LABEL : Cell Value, String Constant - qlLtNNpzFEhu len=0 
' 0018     26 LABEL : Cell Value, String Constant - rCinCDsztDz len=0 
' 0018     25 LABEL : Cell Value, String Constant - rNckAVsRnF len=0 
' 0018     26 LABEL : Cell Value, String Constant - tlmBrygeJvp len=0 
' 0018     25 LABEL : Cell Value, String Constant - TZMUyvawff len=0 
' 0018     25 LABEL : Cell Value, String Constant - UgONwQgyVs len=0 
' 0018     25 LABEL : Cell Value, String Constant - VSQIYsnfvz len=0 
' 0018     24 LABEL : Cell Value, String Constant - YfVXApyRq len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZdBZwf len=0 
' 0018     21 LABEL : Cell Value, String Constant - zrarTc 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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