IcedID — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 847af8ad14f7becf…

MALICIOUS

Office (OOXML) / .XLSM

173.4 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: d566d83e8c0d38efeb07eaa8d247fe9a SHA-1: af3082b5d8d56be30cf18bb1276c33d85833cd36 SHA-256: 847af8ad14f7becfb1ff4ae58ee81d8f892b4675ebf6482315fd2edc643f8a5b
268 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File T1105 Ingress Tool Transfer

The file is an XLSM document containing Excel 4.0 macros, identified by the 'OOXML_XLM_MACROSHEET' and 'OOXML_XLM_DANGEROUS_FN' heuristics. The 'Auto_Open' macro and the use of dangerous XLM functions like 'REGISTER' and 'EXEC' indicate that the macro is designed to download and execute a payload. The presence of multiple URLs in the document body and the ClamAV detection as 'Xls.Downloader.IcedID' strongly suggest this is an IcedID downloader.

Heuristics 8

  • Excel 4.0 macro sheet (3 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.
  • Dangerous XLM formula APIs: FORMULA.FILL, REGISTER, EXEC, GOTO, HALT 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.
  • ClamAV: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • 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 (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 3 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://188.127.254.159/44283,9203350694.dat
    • http://45.150.67.233/44283,9203350694.dat
    • http://195.123.210.174/44283,9203350694.dat
    • http://188.127.254.159/
    • http://45.150.67.233/
    • http://195.123.210.174/
    • 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
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision6

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9456119f4ad9ffbf394753b3270c4cc6771da38eb4b7a68a2e2db0e18d3b2def		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 725 bytes
vbaProject_00.bin
96a4c076c231f55af87e70862a508afd265f594ed85afdd945ccfda6cbacc052		 vba-project OOXML VBA project: xl/vbaProject.bin 10752 bytes
xlm_sheet_00.xml
7cb36c4173ff698a6012f6dfd3257116b399f9beb0e02be12efe4e665ca582cd		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 3563 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
xlm_sheet_01.xml
a2ce2a9e42eae3aa14cd5f223f4b3b59e70988efdd370d2e091e70d8da44ea47		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.xml 1524 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
xlm_sheet_02.xml
c9074d5ab99827dff52b3ed1f36f3677541f7b56256a9ed95f057fdf5c783274		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet3.xml 1509 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.