Emotet Office (OLE) malware analysis — malicious · 7eb7412cb7541b33

MALICIOUS

Office (OLE)

154.6 KB Created: 2020-09-15 06:48:00 Authoring application: Microsoft Office Word

MD5: 9e42be19fb4450948053c5a3a6aec29b SHA-1: 450d56831ee939cf6ef0fc284c3517f24c8ae091 SHA-256: 7eb7412cb7541b33eb8598a52d42fd07bc75d0c1befa37028e0ec41f09dca5e7

300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is a malicious OLE document containing VBA macros. A critical heuristic indicates an obfuscated PowerShell stager within a hidden UserForm, specifically using an EncodedCommand. The Document_Open macro is present and uses CreateObject, suggesting it initiates the malicious execution chain. The ClamAV detection and heuristic firings strongly point to the Emotet family. The PowerShell stager likely downloads and executes a second-stage payload, and the presence of the URL http://schemas.openxmlformats.org/drawingml/2006/main in the document body, despite its benign reputation, is noted.

Heuristics 8

Hidden UserForm PowerShell EncodedCommand stager critical OLE_USERFORM_OBFUSCATED_POWERSHELL

OLE document contains a UTF-16LE form/property string with an obfuscated PowerShell -EncodedCommand payload. The observed macro family reconstructs this hidden string with Split/Join or UserForm property reads and launches it through WMI/COM process creation. This is downloader malware, not an Office CVE exploit.
ClamAV: Doc.Downloader.Emotet-9760846-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Emotet-9760846-0
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.
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 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` `d836c5415d0cd6d772a683c60ac608b6fac152a60e8d7adaeb3bed5561a7f6e2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22931 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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