IcedID — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 137fbaa8e83c5860…

MALICIOUS

Office (OOXML) / .XLSM

176.1 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3c22aef23b09d9766cbdcce82872b279 SHA-1: 5e39e48ab22537dcc29c9d10a62298c09ce635b9 SHA-256: 137fbaa8e83c5860f47a9255c6fed3a2de1c3426b0929feaeecee90f27c3e6a2
230 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

This Excel macro-enabled document (XLSM) contains critical Excel 4.0 macro sheet findings, including the use of dangerous APIs like FORMULA and REGISTER. These functions are used to construct and download a payload from the URL http://45.150.67.231/44285,5327891204.dat. The presence of VBA macros and the ClamAV detection further support its malicious nature, pointing towards the IcedID family.

Heuristics 7

  • 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, 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
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — 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://45.150.67.231/44285,5327891204.dat
    • http://45.150.67.238/44285,5327891204.dat
    • http://195.123.210.171/44285,5327891204.dat
    • http://45.150.67.231/
    • http://45.150.67.238/
    • http://195.123.210.171/
    • 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
6a86a4b9fc11a9108a74ff2aa72ef48244e3e3c4664924dda195b08ed6d5a5b7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 647 bytes
vbaProject_00.bin
1aa08b3dbc7b7ef44d61ede156dbe8cfb44448c68597ff728b471c346009793c		 vba-project OOXML VBA project: xl/vbaProject.bin 10240 bytes
xlm_sheet_00.xml
129fb6003f0d7bf0a0ddcf738c2b8b9c09df9df114ca3e06248807c9946b974b		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 3738 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
xlm_sheet_01.xml
39d7fded054c4f16783762adae220a09b49816a6591e0e8a260b49988ca1129c		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.xml 1518 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
xlm_sheet_02.xml
07258137112005cd5e106922ed115dfa9bf05fde6dae69ea4d5761bf89b0eea6		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet3.xml 1513 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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