Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7a1bfe884a5cb3cd…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:45 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 80130a7c6a89b8f8924f538ba5d4e05b SHA-1: 6aac461f3dd2968cc88f23dcb69468644961f37d SHA-256: 7a1bfe884a5cb3cdc0519d4d7db29334d02c323e9906ca2107c68169dce99f59
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open entry, which is a known method for executing malicious code within older Excel versions. The critical heuristic 'OLE_XLM_DANGEROUS_FN' indicates the use of dangerous formula APIs like 'RUN', suggesting the macro is designed to execute arbitrary commands or download further payloads. The exact nature of the payload is not discernible from the provided evidence.

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) 6830 bytes
SHA-256: cad2f9e4ff5a11d5c47997136c9389abdf0ba14e7dfccbe9671915ae3108423b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  sQlGqOSIRn
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H130 
' 0018     24 LABEL : Cell Value, String Constant - AvLFYvgMh len=0 
' 0018     25 LABEL : Cell Value, String Constant - ctUieermPw len=0 
' 0018     22 LABEL : Cell Value, String Constant - dDBoedf len=0 
' 0018     26 LABEL : Cell Value, String Constant - EFdwqBXoFwA len=0 
' 0018     23 LABEL : Cell Value, String Constant - eIueduIJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - ElmwxwAh len=0 
' 0018     21 LABEL : Cell Value, String Constant - evPMFX len=0 
' 0018     22 LABEL : Cell Value, String Constant - iypNGid len=0 
' 0018     20 LABEL : Cell Value, String Constant - kHsfO len=0 
' 0018     24 LABEL : Cell Value, String Constant - LmuujKCYQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - NGKfFWZcXCdA len=0 
' 0018     24 LABEL : Cell Value, String Constant - oSnrzcGQF len=0 
' 0018     22 LABEL : Cell Value, String Constant - PbNQRgp len=0 
' 0018     22 LABEL : Cell Value, String Constant - psXJnLJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - QJLYN len=0 
' 0018     22 LABEL : Cell Value, String Constant - SHwKEQW len=0 
' 0018     24 LABEL : Cell Value, String Constant - SnGDyGnBa len=0 
' 0018     25 LABEL : Cell Value, String Constant - XOmVRKQMuz len=0 
' 0018     22 LABEL : Cell Value, String Constant - YapbLko len=0 
' 0018     20 LABEL : Cell Value, String Constant - zoRgr 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 LABE
... (truncated)

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