IcedID Office (OOXML) / .DOC malware analysis — malicious · 2556c174b7a4cb47

MALICIOUS

Office (OOXML) / .DOC

34.3 KB Created: 2021-11-09 09:44:00 UTC Authoring application: Microsoft Office Word 16.0000

MD5: a3ba7c9ce2e74881949b25f87ea23d7b SHA-1: cb633359d3ae7b4e2a8509b69c8dba733ab2d5a9 SHA-256: 2556c174b7a4cb47d3e3b59942a7866f7ee42723c1335ed0affd0b0b7c8d1e28

322 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1059.001 PowerShell

The sample is a malicious OOXML document containing VBA macros. The `document_open` macro triggers the `main.karoline` subroutine, which retrieves a value from the document's keywords property and saves it as a file named 'macros.bas'. It then calls the `ThisDocument.s` function, which uses `WScript.Shell` to execute the saved file. The `s` function reconstructs the command string 'exploite' by concatenating 'explo' and 'e' with the argument 'r'. This indicates the macro's intent is to download and execute a second-stage payload.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
ClamAV: Doc.Downloader.IcedID-8ff0f02ff0876072-9950256-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.IcedID-8ff0f02ff0876072-9950256-0
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high 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.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
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://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
- http://schemas.microsoft.com/office/drawing/2014/chartex
- http://schemas.microsoft.com/office/drawing/2015/9/8/chartex
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/officeDocument/2006/math
- http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
- http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
- http://schemas.openxmlformats.org/wordprocessingml/2006/main
- http://schemas.microsoft.com/office/word/2010/wordml
- http://schemas.microsoft.com/office/word/2012/wordml
- http://schemas.microsoft.com/office/word/2015/wordml/symex
- http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
- http://schemas.microsoft.com/office/word/2010/wordprocessingInk
- http://schemas.microsoft.com/office/word/2006/wordml
- http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `d3d939c6d6d12dee1fb985ce157c04b8116e13030673db689f7e1e4e645f2a95`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1020 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `8da9efa0c04fd5e610cf0662e88e2efaa939723e2670eefafa7d42b453b4e2d6`	vba-project	OOXML VBA project: word/vbaProject.bin	15360 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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