Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 12b53fa4cc58ff85…

MALICIOUS

Office (OLE)

116.5 KB Created: 2015-04-14 21:53:59 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 096fa1ae567292e9ce43af9ba5f1fb50 SHA-1: d1fb22a00e07d0f3986aeb8616f7e12f0c35be68 SHA-256: 12b53fa4cc58ff85267c6c9dbc98ce21fb33e620502c8a0c0728fe617159d25c
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open macro, which is a known technique for executing malicious code upon opening. The document body displays a "DOCUMENT PROTECTED!" message, urging the user to "Enable Editing" and "Enable Content", a common lure for macro-enabled malicious documents. The presence of the Auto_Open macro and the deceptive document content strongly suggests a malicious intent to execute arbitrary code.

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) 57965 bytes
SHA-256: 56f59eab3120f4ec6d80e84ceed5bd530f000e26426ca57bc0eb78ec6c2e3c0f
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 -  TiT5G5EGsTz3o1txc
' 0018     19 LABEL : Cell Value, String Constant - afpE len=0 
' 0018     19 LABEL : Cell Value, String Constant - aOCO len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!HG53026 
' 0018     20 LABEL : Cell Value, String Constant - AvRaW len=0 
' 0018     21 LABEL : Cell Value, String Constant - aYStWH len=0 
' 0018     21 LABEL : Cell Value, String Constant - bACODH len=0 
' 0018     20 LABEL : Cell Value, String Constant - BHcez len=0 
' 0018     18 LABEL : Cell Value, String Constant - BpC len=0 
' 0018     21 LABEL : Cell Value, String Constant - bRkCXG len=0 
' 0018     19 LABEL : Cell Value, String Constant - bzFN len=0 
' 0018     21 LABEL : Cell Value, String Constant - cEvSzl len=0 
' 0018     21 LABEL : Cell Value, String Constant - CwlGqa len=0 
' 0018     31 LABEL : Cell Value, String Constant -       hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\xe8B8Cr\x00r\x00'
' 0018     32 LABEL : Cell Value, String Constant -        hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\xbfa\xdea\xfc\x00\xfc\x00'
' 0018     21 LABEL : Cell Value, String Constant - dhSpAn len=0 
' 0018     18 LABEL : Cell Value, String Constant - Dni len=0 
' 0018     20 LABEL : Cell Value, String Constant - ECLbQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - eHAOI len=0 
' 0018     21 LABEL : Cell Value, String Constant - ehppXH len=0 
' 0018     19 LABEL : Cell Value, String Constant - ERUT len=0 
' 0018     20 LABEL : Cell Value, String Constant - FEylz len=0 
' 0018     19 LABEL : Cell Value, String Constant - FIao len=0 
' 0018     21 LABEL : Cell Value, String Constant - fxwhOr len=0 
' 0018     20 LABEL : Cell Value, String Constant - GLMJc len=0 
' 0018     20 LABEL : Cell Value, String Constant - gQUuU len=0 
' 0018     20 LABEL : Cell Value, String Constant - GRJhY len=0 
' 0018     19 LABEL : Cell Value, String Constant - GUsx len=0 
' 0018     21 LABEL : Cell Value, String Constant - HHsbpq len=0 
' 0018     20 LABEL : Cell Value, String Constant - HIVzL len=0 
' 0018     33 LABEL : Cell Value, String Constant -         hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b"\x00\x00bP\x82P'\x00'\x00"
' 0018     20 LABEL : Cell Value, String Constant - hNAIn len=0 
' 0018     20 LABEL : Cell Value, String Constant - HnEFo len=0 
' 0018     21 LABEL : Cell Value, String Constant - hNYCnh len=0 
' 0018     19 LABEL : Cell Value, String Constant - IEae len=0 
' 0018     19 LABEL : Cell Value, String Constant - ifYK len=0 
' 0018     19 LABEL : Cell Value, String Constant - iQSC len=0 
' 0018     31 LABEL : Cell Value, String Constant - IVxOonutB hidden len=7 ptgRef3d  Sheet!HG53026 
' 0018     18 LABEL : Cell Value, String Constant - jRX len=0 
' 0018     19 LABEL : Cell Value, String Constant - jYIH len=0 
' 0018     21 LABEL : Cell Value, String Constant - kfUwwf len=0 
' 0018     18 LABEL : Cell Value, String Constant - kop len=0 
' 0018     18 LABEL : Cell Value, String Constant - kSe len=0 
' 0018     19 LABEL : Cell Value, String Constant - LDAH len=0 
' 0018     34 LABEL : Cell Value, String Constant -          hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\xd7\x7f\x02\x80\x9a\x00\x9a\x00'
' 0018     19 LABEL : Cell Value, String Constant - LUhJ len=0 
' 0018     18 LABEL : Cell Value, String Constant - LuM len=0 
' 0018     21 LABEL : Cell Value, String Constant - LXfgMO len=0 
' 0018     19 LABEL : Cell Value, String Constant - lXNX len=0 
' 0018     21 LABEL : Cell Value, String Constant - MJQCnJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - mnyfN len=0 
' 0018     19 LABEL : Cell Value, String Constant - MrnK len=0 
' 0018     19 LABEL : Cell Value, String Constant - nfnt
... (truncated)

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