Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e4074173fcb47fe1…

MALICIOUS

Office (OLE)

134.0 KB Created: 2017-03-09 21:40:00 Authoring application: Microsoft Excel First seen: 2020-08-10
MD5: c656b9c3b60b0684b3da3273b2a6af52 SHA-1: 38169c49d6a1c2123873d69b360039ba08fc33b0 SHA-256: e4074173fcb47fe19ff7f7b941f680e3d8ac4316d4ea703fee1124f92c42100c
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The document body contains a social engineering lure to enable content, which would trigger the macro. No specific IOCs like URLs or hashes were extracted, but the presence of the Auto_Open macro is a critical finding.

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) 79570 bytes
SHA-256: 3613aad6f1d296cc413982fb31fe13c0ae9b964087357f8eaeed0b33977f922a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     26 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  UvhNp2xfUDsPad8dM
' 0018     18 LABEL : Cell Value, String Constant - ADD len=0 
' 0018     20 LABEL : Cell Value, String Constant - AdeDi len=0 
' 0018     20 LABEL : Cell Value, String Constant - AFlVQ len=0 
' 0018     18 LABEL : Cell Value, String Constant - aFW len=0 
' 0018     21 LABEL : Cell Value, String Constant - AgUbtO len=0 
' 0018     18 LABEL : Cell Value, String Constant - ain len=0 
' 0018     19 LABEL : Cell Value, String Constant - aQey len=0 
' 0018     21 LABEL : Cell Value, String Constant - Arxtid len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!HW25852 
' 0018     21 LABEL : Cell Value, String Constant - AVVXsl len=0 
' 0018     18 LABEL : Cell Value, String Constant - BBh len=0 
' 0018     20 LABEL : Cell Value, String Constant - bCLgT len=0 
' 0018     21 LABEL : Cell Value, String Constant - bnSGKf len=0 
' 0018     20 LABEL : Cell Value, String Constant - bqHzr len=0 
' 0018     19 LABEL : Cell Value, String Constant - brIs len=0 
' 0018     18 LABEL : Cell Value, String Constant - BSd len=0 
' 0018     21 LABEL : Cell Value, String Constant - bvckMp len=0 
' 0018     18 LABEL : Cell Value, String Constant - BwS len=0 
' 0018     21 LABEL : Cell Value, String Constant - cEtjMw len=0 
' 0018     19 LABEL : Cell Value, String Constant - ChlF len=0 
' 0018     21 LABEL : Cell Value, String Constant - CwClob len=0 
' 0018     21 LABEL : Cell Value, String Constant - DbSslI len=0 
' 0018     19 LABEL : Cell Value, String Constant - DBwC len=0 
' 0018     21 LABEL : Cell Value, String Constant - dEnMsR len=0 
' 0018     19 LABEL : Cell Value, String Constant - DPVo len=0 
' 0018     18 LABEL : Cell Value, String Constant - EAg len=0 
' 0018     21 LABEL : Cell Value, String Constant - EdMssT len=0 
' 0018     19 LABEL : Cell Value, String Constant - EDyL len=0 
' 0018     21 LABEL : Cell Value, String Constant - EpuBEv len=0 
' 0018     21 LABEL : Cell Value, String Constant - fEvGxc len=0 
' 0018     21 LABEL : Cell Value, String Constant - FGGmod len=0 
' 0018     21 LABEL : Cell Value, String Constant - fiiDxy len=0 
' 0018     19 LABEL : Cell Value, String Constant - FKXQ len=0 
' 0018     18 LABEL : Cell Value, String Constant - fRn len=0 
' 0018     20 LABEL : Cell Value, String Constant - FSZdu len=0 
' 0018     21 LABEL : Cell Value, String Constant - GDoMCe len=0 
' 0018     19 LABEL : Cell Value, String Constant - gfTi len=0 
' 0018     20 LABEL : Cell Value, String Constant - gmAmh len=0 
' 0018     19 LABEL : Cell Value, String Constant - gNBt len=0 
' 0018     19 LABEL : Cell Value, String Constant - gRVr len=0 
' 0018     21 LABEL : Cell Value, String Constant - hdBLTk len=0 
' 0018     19 LABEL : Cell Value, String Constant - hKrW len=0 
' 0018     34 LABEL : Cell Value, String Constant -          hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\x8f\xc4\xaf\xc4\x08\x00\x08\x00'
' 0018     19 LABEL : Cell Value, String Constant - howC len=0 
' 0018     21 LABEL : Cell Value, String Constant - HuYaDn len=0 
' 0018     21 LABEL : Cell Value, String Constant - hWFyOs len=0 
' 0018     20 LABEL : Cell Value, String Constant - hXgWE len=0 
' 0018     18 LABEL : Cell Value, String Constant - IAf len=0 
' 0018     19 LABEL : Cell Value, String Constant - IcBx len=0 
' 0018     21 LABEL : Cell Value, String Constant - IfzJYr len=0 
' 0018     19 LABEL : Cell Value, String Constant - Igvb len=0 
' 0018     21 LABEL : Cell Value, String Constant - IHIPkt len=0 
' 0018     21 LABEL : Cell Value, String Constant - iHsxcD len=0 
' 0018     19 LABEL : Cell Value, String Constant - IkYi len=0 
' 0018     33 LABEL : Cell Value, String Constant -         hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00B\xbf\xb4\xbfl\x00l\x00'
' 0018     21 LABEL : Cell Value, String Constant 
... (truncated)

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