Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d482b85d5edf9b28…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:14 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 2dfb1bdcdc3b2a6db1d4f56c4002e48e SHA-1: fcede2f31abacdd260e130344d389840085f1199 SHA-256: d482b85d5edf9b2882e1d8a30ecebd8bfd9a86022a6e0bd70f322de5679277b5
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 function, which is a common technique for executing malicious code upon opening. The critical heuristics indicate the presence of dangerous formula APIs within the XLM macro, suggesting an attempt to exploit the application or download a secondary payload. No specific IOCs like URLs or hashes were extracted, but the presence of the Auto_Open macro is a strong indicator of malicious intent.

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) 6811 bytes
SHA-256: fa0ec0fef564f5d20db78afea2272f18d8616eecf466317fe9421de20334ec24
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xNGnBWE
' 0018     21 LABEL : Cell Value, String Constant - AcksUB len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F167 
' 0018     21 LABEL : Cell Value, String Constant - CTUrWr len=0 
' 0018     23 LABEL : Cell Value, String Constant - cXQVVFnQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - DkJpncPOk len=0 
' 0018     20 LABEL : Cell Value, String Constant - HfAFd len=0 
' 0018     22 LABEL : Cell Value, String Constant - iRUsMva len=0 
' 0018     24 LABEL : Cell Value, String Constant - mUniTmZOx len=0 
' 0018     24 LABEL : Cell Value, String Constant - naDCnWHsd len=0 
' 0018     22 LABEL : Cell Value, String Constant - NUncvoz len=0 
' 0018     27 LABEL : Cell Value, String Constant - oajIoWVhUtcu len=0 
' 0018     21 LABEL : Cell Value, String Constant - ObavbR len=0 
' 0018     23 LABEL : Cell Value, String Constant - pUqNWRUa len=0 
' 0018     22 LABEL : Cell Value, String Constant - PVOJafz len=0 
' 0018     25 LABEL : Cell Value, String Constant - QtqslbasYO len=0 
' 0018     24 LABEL : Cell Value, String Constant - rzbLCTnSQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - SzaNzRdmsenP len=0 
' 0018     26 LABEL : Cell Value, String Constant - XkjDODwBBbh len=0 
' 0018     27 LABEL : Cell Value, String Constant - XqGbrYgbMjbR len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZElptYt len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZKttq 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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