Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c82b83f76fbe3af9…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:09 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 7c9059b48e8343810af33cc9cc377f02 SHA-1: 4d32300f58846aab579971929d27f1122bcedc72 SHA-256: c82b83f76fbe3af997a3cfc66b0fa31aac3112713ccea70839e96867e07681ac
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 upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands. While the exact payload is not discernible from the provided evidence, the mechanism points to a malicious document designed for initial execution.

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) 6789 bytes
SHA-256: 0365e4347bd850f891974314c1ac45886cbf9d4c1bff0d3657d7497b820746e5
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 -  SWXnuM
' 0018     24 LABEL : Cell Value, String Constant - AdiURwQfT len=0 
' 0018     27 LABEL : Cell Value, String Constant - aQAshuHXAKFO len=0 
' 0018     27 LABEL : Cell Value, String Constant - AuQxKQHSXfjZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G180 
' 0018     21 LABEL : Cell Value, String Constant - BZRDJY len=0 
' 0018     26 LABEL : Cell Value, String Constant - CZagCnIevEA len=0 
' 0018     20 LABEL : Cell Value, String Constant - gKeeg len=0 
' 0018     25 LABEL : Cell Value, String Constant - gNZRLTnMLZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - gVDNGe len=0 
' 0018     23 LABEL : Cell Value, String Constant - hvuCZWxZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - iVrPOBsDsamz len=0 
' 0018     27 LABEL : Cell Value, String Constant - jibEsXXqFIdS len=0 
' 0018     26 LABEL : Cell Value, String Constant - JuVgXiRPtDb len=0 
' 0018     25 LABEL : Cell Value, String Constant - lAERXcTRrK len=0 
' 0018     26 LABEL : Cell Value, String Constant - OyvLPlTXlwK len=0 
' 0018     27 LABEL : Cell Value, String Constant - qPOsLUbqklov len=0 
' 0018     22 LABEL : Cell Value, String Constant - UAjTlmf len=0 
' 0018     24 LABEL : Cell Value, String Constant - VaTLpkIdT len=0 
' 0018     21 LABEL : Cell Value, String Constant - VxKkSp len=0 
' 0018     27 LABEL : Cell Value, String Constant - WvkuKtHLjqMO len=0 
' 0018     21 LABEL : Cell Value, String Constant - zffCPF 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 Constan
... (truncated)

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