Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9ba2127cd887aa9e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:47:11 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 08bc9c58dc541e991c2bf676654ada17 SHA-1: 06020427d3c1fc6a3a5c5c0651d97aa8053ebad1 SHA-256: 9ba2127cd887aa9e837efaf5d319480840971db7b091b8d2bcf45faa18e8f697
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 presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands or download further payloads. While the specific payload is not directly visible, the Auto_Open macro is the primary execution vector.

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) 6336 bytes
SHA-256: 16ab1adc57979efa2d2bd2f9eb9fa2275b7a4221f4033679e78872fe91c01ff3
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tyR
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G163 
' 0018     22 LABEL : Cell Value, String Constant - bIiVIKM len=0 
' 0018     27 LABEL : Cell Value, String Constant - bybkWEMxHRNQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - ClgaNVr len=0 
' 0018     26 LABEL : Cell Value, String Constant - cPgCQYJYwuO len=0 
' 0018     22 LABEL : Cell Value, String Constant - CRSeiHb len=0 
' 0018     23 LABEL : Cell Value, String Constant - cVWyfrpw len=0 
' 0018     24 LABEL : Cell Value, String Constant - dHdCHgzyF len=0 
' 0018     21 LABEL : Cell Value, String Constant - Doopun len=0 
' 0018     20 LABEL : Cell Value, String Constant - DtNLw len=0 
' 0018     23 LABEL : Cell Value, String Constant - fNHEIywt len=0 
' 0018     20 LABEL : Cell Value, String Constant - GJSie len=0 
' 0018     22 LABEL : Cell Value, String Constant - GTHazsB len=0 
' 0018     23 LABEL : Cell Value, String Constant - hYUtlwCu len=0 
' 0018     23 LABEL : Cell Value, String Constant - LDUooojU len=0 
' 0018     25 LABEL : Cell Value, String Constant - NLihDkXbgl len=0 
' 0018     25 LABEL : Cell Value, String Constant - pTcaHRtfku len=0 
' 0018     22 LABEL : Cell Value, String Constant - rmCBfaI len=0 
' 0018     22 LABEL : Cell Value, String Constant - WCHcOSV len=0 
' 0018     23 LABEL : Cell Value, String Constant - WXwSXVoi len=0 
' 0018     25 LABEL : Cell Value, String Constant - zVOGjIETNn 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 LABELSST 
... (truncated)

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