Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f0622833ac1eaf90…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:33 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 1fafc7ede5f5e7b8bf9d34d5e64fc45b SHA-1: 3b0ef3e24c033ea4c0bb9439d071c67e082cf281 SHA-256: f0622833ac1eaf9012d25e1089a2075eca80bc84aa91b713cedd9da9519c735c
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 indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While the exact payload is not clear from the provided evidence, the Auto_Open function is a common technique for initial execution of malware.

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) 6686 bytes
SHA-256: 86742361eeb0017a714cf3a8e3597d663648034909f5bb5b216b85d2bfc4e956
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 -  CXdylr
' 0018     20 LABEL : Cell Value, String Constant - aCrel len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B207 
' 0018     20 LABEL : Cell Value, String Constant - AVoCd len=0 
' 0018     25 LABEL : Cell Value, String Constant - aXRJAkusVv len=0 
' 0018     21 LABEL : Cell Value, String Constant - CNyEQE len=0 
' 0018     26 LABEL : Cell Value, String Constant - DimDjshKxSF len=0 
' 0018     21 LABEL : Cell Value, String Constant - DzGmKS len=0 
' 0018     26 LABEL : Cell Value, String Constant - HbvWZCmFzDX len=0 
' 0018     23 LABEL : Cell Value, String Constant - hWNXHYXO len=0 
' 0018     27 LABEL : Cell Value, String Constant - iuSmJaiVrseG len=0 
' 0018     26 LABEL : Cell Value, String Constant - kMtBEmtMXeL len=0 
' 0018     21 LABEL : Cell Value, String Constant - KNkbJg len=0 
' 0018     24 LABEL : Cell Value, String Constant - LzHkIWGpV len=0 
' 0018     24 LABEL : Cell Value, String Constant - OTazFjznD len=0 
' 0018     27 LABEL : Cell Value, String Constant - PAUMBSWtGGRK len=0 
' 0018     21 LABEL : Cell Value, String Constant - QRNVRM len=0 
' 0018     24 LABEL : Cell Value, String Constant - TNSEKwxGg len=0 
' 0018     21 LABEL : Cell Value, String Constant - tWHfqV len=0 
' 0018     22 LABEL : Cell Value, String Constant - VERozkM len=0 
' 0018     24 LABEL : Cell Value, String Constant - wIizcoZyD len=0 
' 0018     26 LABEL : Cell Value, String Constant - YSokXroFTLb 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     
... (truncated)

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