Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 82d24fd9bbaaeb6c…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:08 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: c3e6a80aa14deff21f86484b26e97fa0 SHA-1: 0ecae7a2e8368d2f38461df95175d4a1dc9b5342 SHA-256: 82d24fd9bbaaeb6cbea6c86a48b3c5616bf8996c29bccba94ecd074392338d40
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 defined name, which is a critical finding indicating automatic execution. The presence of dangerous formula APIs like RUN in the XLM macro sheet strongly suggests the execution of arbitrary code. While no specific URLs or hashes were extracted, the mechanism points towards a downloader or initial execution stage.

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) 6736 bytes
SHA-256: 78219cace4958468954e217547a4e19a2210f50b7531dd3046638ddc613deb50
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 -  CZSqLy
' 0018     25 LABEL : Cell Value, String Constant - aPJEMmzXZr len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G176 
' 0018     27 LABEL : Cell Value, String Constant - AzOAwMNgLBiH len=0 
' 0018     26 LABEL : Cell Value, String Constant - dPFGTUEKlcO len=0 
' 0018     23 LABEL : Cell Value, String Constant - dvWfagjG len=0 
' 0018     25 LABEL : Cell Value, String Constant - ervQvKYYcf len=0 
' 0018     24 LABEL : Cell Value, String Constant - FIEvYNoRc len=0 
' 0018     21 LABEL : Cell Value, String Constant - ImbGDj len=0 
' 0018     23 LABEL : Cell Value, String Constant - KOjmQfdW len=0 
' 0018     20 LABEL : Cell Value, String Constant - LFUtv len=0 
' 0018     22 LABEL : Cell Value, String Constant - NZoUcMS len=0 
' 0018     23 LABEL : Cell Value, String Constant - OxUAWlRS len=0 
' 0018     21 LABEL : Cell Value, String Constant - pLOBlk len=0 
' 0018     23 LABEL : Cell Value, String Constant - qFljnHaO len=0 
' 0018     23 LABEL : Cell Value, String Constant - rvSrnMvH len=0 
' 0018     22 LABEL : Cell Value, String Constant - rXmFogz len=0 
' 0018     20 LABEL : Cell Value, String Constant - VefqJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - XabHkajwXms len=0 
' 0018     22 LABEL : Cell Value, String Constant - XBOwcdu len=0 
' 0018     24 LABEL : Cell Value, String Constant - yxMMLmcWQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZMQqtTbdy 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 LA
... (truncated)

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