Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0827610611e39c3e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:11 Authoring application: Microsoft Excel First seen: 2021-09-22
MD5: 6eabfdd82795593f8df24cbe05a19320 SHA-1: 91b985bb0d7aa91a2429fbe86a5771ab835c2c34 SHA-256: 0827610611e39c3e02b9e285ebdc19a4a0478bf607747b58baf1390d2de54b3c
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs in the Auto_Open macro indicates an intent to run arbitrary commands. While no specific URLs or hashes were extracted, the macro's execution capability is the primary threat.

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: 7b8ee90882624db1f776474a03060d83c02daf7e5efa9b3a18050bc956f0ba4b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xsmoNBIjhL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E154 
' 0018     24 LABEL : Cell Value, String Constant - ClrjvmbEo len=0 
' 0018     26 LABEL : Cell Value, String Constant - cwNsLsmzwlo len=0 
' 0018     22 LABEL : Cell Value, String Constant - dNWRyus len=0 
' 0018     23 LABEL : Cell Value, String Constant - EZOJhacX len=0 
' 0018     22 LABEL : Cell Value, String Constant - FdOfEyX len=0 
' 0018     20 LABEL : Cell Value, String Constant - fLCgu len=0 
' 0018     22 LABEL : Cell Value, String Constant - frlwkkV len=0 
' 0018     27 LABEL : Cell Value, String Constant - gyLMScBLEjBP len=0 
' 0018     23 LABEL : Cell Value, String Constant - iBVKEoym len=0 
' 0018     26 LABEL : Cell Value, String Constant - IkRPZZBrpDV len=0 
' 0018     20 LABEL : Cell Value, String Constant - JGPMh len=0 
' 0018     24 LABEL : Cell Value, String Constant - oBuUDToeD len=0 
' 0018     27 LABEL : Cell Value, String Constant - psBpZYwMcFAX len=0 
' 0018     22 LABEL : Cell Value, String Constant - qJzVDRn len=0 
' 0018     23 LABEL : Cell Value, String Constant - SqOCRSrr len=0 
' 0018     27 LABEL : Cell Value, String Constant - WntfpjyjdtZc len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZAfiP len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZKaIlZUpt len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZRdzJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZWWLidDYbiTB 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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