MALICIOUS
220
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The sample is an Excel 4.0 macro-enabled document that contains an Auto_Open macro. Heuristics indicate that the macro attempts environment evasion and uses dangerous formula APIs, including a RUN function. The document body also contains a lure to enable macros, suggesting a malicious intent to execute the embedded XLM macro.
Heuristics 5
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Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAMEoletools 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.
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XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FNExcel 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.
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XLM Auto_Open environment-evasion close gate critical OLE_XLM_ENVIRONMENT_EVASION_CLOSEExcel 4.0 macro sheet auto-executes environment checks with GET.WORKSPACE / GET.WINDOW, then shows a fake corruption/error message and closes the workbook when the host fails those checks. This is a malware sandbox-evasion pattern, even when the later payload stage is hidden behind obfuscated defined-name flow.
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Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPENWorkbook 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.
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Macro/content-enable lure medium SE_ENABLE_LUREDocument instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_macros.txt |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 77507 bytes |
SHA-256: bc9a2b103c7ceb496eca8b08679f4e657662846706678103467a013fc7a53be5 |
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Preview scriptFirst 1,000 lines of the extracted script
' 0085 10 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - x ' 0085 18 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - SODXOEScL ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - Sheet ' 0018 23 LABEL : Cell Value, String Constant - aaZePIPt len=0 ' 0018 21 LABEL : Cell Value, String Constant - alrnyQ len=0 ' 0018 53 LABEL : Cell Value, String Constant - anCjBmqQFCvOLiEcieqtIdfoysWmFZsmcIRRQU len=0 ' 0018 17 LABEL : Cell Value, String Constant - at len=0 ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d x!IY50964 ' 0018 20 LABEL : Cell Value, String Constant - besOQ len=0 ' 0018 60 LABEL : Cell Value, String Constant - BGqxFVvuLBEvUxcaIwRIyMWFFssTcoRkQnGSGDwPMjTdj len=0 ' 0018 41 LABEL : Cell Value, String Constant - bkljoMSZERQgjmeDSLvdfzchur len=0 ' 0018 23 LABEL : Cell Value, String Constant - bQkbSfqZ len=0 ' 0018 29 LABEL : Cell Value, String Constant - bQkbSfqZYMxZvI len=0 ' 0018 59 LABEL : Cell Value, String Constant - BRxEXfUzvvtykdkPpbquxpOrWGCqLBrGQyylYzViwevh len=0 ' 0018 30 LABEL : Cell Value, String Constant - bTPbrHcQZwrVXEX len=0 ' 0018 57 LABEL : Cell Value, String Constant - BVxCQNvJiiKSeHaGevWvHBTDZJUaWhyNVWgEybdKQj len=0 ' 0018 26 LABEL : Cell Value, String Constant - BwJaoKxHeZD len=0 ' 0018 21 LABEL : Cell Value, String Constant - bXizPk len=0 ' 0018 25 LABEL : Cell Value, String Constant - CbEjTPDYOF len=0 ' 0018 55 LABEL : Cell Value, String Constant - cmWVJuWsFTBSEIiWUOgdzVuzvILavwGQLoEWqKFt len=0 ' 0018 49 LABEL : Cell Value, String Constant - cMXdZkCDYajHnRhOUnvkQMMKPBtBfGrHLO len=0 ' 0018 20 LABEL : Cell Value, String Constant - cSxHH len=0 ' 0018 39 LABEL : Cell Value, String Constant - cWolIdDIEQTiEFOYTwMfySNC len=0 ' 0018 24 LABEL : Cell Value, String Constant - dBvZbIchp len=0 ' 0018 58 LABEL : Cell Value, String Constant - DfkyudqQQrBNoJnMeEepjCkIrCIEQgvDFOlgKMsySaP len=0 ' 0018 32 LABEL : Cell Value, String Constant - dlaGPQOTqwFivuLPR len=0 ' 0018 43 LABEL : Cell Value, String Constant - dqdQrOMoWnZdEdoiBxVqPIEPguQE len=0 ' 0018 21 LABEL : Cell Value, String Constant - dqpGKM len=0 ' 0018 45 LABEL : Cell Value, String Constant - DUGKkKVPhfCXvokvNbxkuSNqrYsxGv len=0 ' 0018 24 LABEL : Cell Value, String Constant - dXpmJsEJG len=0 ' 0018 22 LABEL : Cell Value, String Constant - EbJlCio len=0 ' 0018 20 LABEL : Cell Value, String Constant - eBZRN len=0 ' 0018 24 LABEL : Cell Value, String Constant - eCjNcJPiq len=0 ' 0018 22 LABEL : Cell Value, String Constant - EdrkVDF len=0 ' 0018 58 LABEL : Cell Value, String Constant - ELNWtoSUBHaiXDyyxCntBSsrIxBsRuZXFtOEuJTCCoo len=0 ' 0018 23 LABEL : Cell Value, String Constant - emnxVQtu len=0 ' 0018 22 LABEL : Cell Value, String Constant - etPQZje len=0 ' 0018 24 LABEL : Cell Value, String Constant - EvgOQkNSf len=0 ' 0018 23 LABEL : Cell Value, String Constant - FEJtmtYy len=0 ' 0018 34 LABEL : Cell Value, String Constant - FfqkDzXsRJGRiwSGPnh len=0 ' 0018 20 LABEL : Cell Value, String Constant - FjhQE len=0 ' 0018 38 LABEL : Cell Value, String Constant - FlGLTJoxxvBYfmRddswzrQf len=0 ' 0018 36 LABEL : Cell Value, String Constant - fLiBaBMGYIeOYeamESabk len=0 ' 0018 20 LABEL : Cell Value, String Constant - fLUUS ... (truncated) |
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