Office (OLE) / .DOCX malware analysis — malicious · 046eca51b5320c60

MALICIOUS

Office (OLE) / .DOCX

161.4 KB Created: 2021-01-04 16:15:00 Authoring application: Microsoft Office Word

MD5: 257ffd6b4c8f299cfe7b717976e06f71 SHA-1: a1bdf3ee96a2a2bf0cef660d0faff34f5f5f31c1 SHA-256: 046eca51b5320c60641116cde38fc1f11ba67cfeb38ee1abc034e8ff05733324

262 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains a VBA macro that executes upon opening the document. This macro uses obfuscated strings to instantiate the 'Scripting.FileSystemObject' and proceeds to create and write to files on the filesystem, such as 'X:\LuIIO\zUSvuJZ.anUcEiFX'. This behavior suggests the document is a downloader or dropper for further malicious payloads.

Heuristics 7

Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION

VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
ClamAV: Doc.Downloader.EmotetRed02224-9938637-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02224-9938637-0
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
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.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `b7c08445609ad3b9c2a0766b1423df26453c524cbf6c8eca0da53a1732c00612`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	7252 bytes

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