Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e8c6332ea6e920a3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:55 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 1a7686731d373634a200364edd16b244 SHA-1: 2828d13d08c9117adbd44b0b6b827a3ed64c7497 SHA-256: e8c6332ea6e920a3eeb8e134cfeb9b53d250b04f7d6f50ad8138e0f79bd5454d
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 common technique for executing malicious code. The `RUN` function API is also present, suggesting the macro is designed to launch an external process or payload. Without further script content, the exact nature of the payload remains unknown, but the intent is clearly 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) 6412 bytes
SHA-256: 606f3c9c778e0b12c2769b8d258e0e6131c7a80a8a274812c5611df23988c95b
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 -  oLY
' 0018     24 LABEL : Cell Value, String Constant - aIfoAsKRH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B184 
' 0018     22 LABEL : Cell Value, String Constant - AUxFcTT len=0 
' 0018     22 LABEL : Cell Value, String Constant - azkBznd len=0 
' 0018     20 LABEL : Cell Value, String Constant - Bftxq len=0 
' 0018     23 LABEL : Cell Value, String Constant - dzLoDhwD len=0 
' 0018     21 LABEL : Cell Value, String Constant - eSYhRY len=0 
' 0018     22 LABEL : Cell Value, String Constant - FvOruPo len=0 
' 0018     27 LABEL : Cell Value, String Constant - HOydQKzlJLuK len=0 
' 0018     27 LABEL : Cell Value, String Constant - HPqibutWornC len=0 
' 0018     22 LABEL : Cell Value, String Constant - IODAqzx len=0 
' 0018     27 LABEL : Cell Value, String Constant - LHAuVAUkmfIS len=0 
' 0018     25 LABEL : Cell Value, String Constant - SmfiiGiFfS len=0 
' 0018     25 LABEL : Cell Value, String Constant - SUkVXWjQhg len=0 
' 0018     25 LABEL : Cell Value, String Constant - TaiLMFKhEO len=0 
' 0018     24 LABEL : Cell Value, String Constant - TOHdhtOuP len=0 
' 0018     26 LABEL : Cell Value, String Constant - tQwjZBOeSqH len=0 
' 0018     25 LABEL : Cell Value, String Constant - uabUeSKMIY len=0 
' 0018     25 LABEL : Cell Value, String Constant - uRLhzIySgc len=0 
' 0018     20 LABEL : Cell Value, String Constant - wdItf len=0 
' 0018     26 LABEL : Cell Value, String Constant - WnDDtBQFpUz 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
' 00f
... (truncated)

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