Office (OLE) / .DOC malware analysis — malicious · 7cf2db52892613d8

MALICIOUS

Office (OLE) / .DOC

32.5 KB Created: 2001-05-30 15:45:00 Authoring application: Microsoft Word 9.0

MD5: ebe499343061e49ea4f31639fc3a7e59 SHA-1: 89de7abdbdc3fc8764d481a49125b8a3cebf6f05 SHA-256: 7cf2db52892613d8bfff7fe6466419b0e29fac8ab77859ba097435c80e1311c1

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1071.001 Web Protocols T1041 Exfiltration Over C2 Protocol

The sample is a malicious Word document containing VBA macros. The AutoOpen macro executes upon opening the document. It attempts to save a copy of itself as 'C:\Windows\Maya.doc' and creates a file 'C:\Maya\hello.txt' with specific text. It also creates and copies a 'script.ini' file to various MIRC directories, likely for spreading via IRC. The script also attempts to interact with Outlook, suggesting potential for email-based propagation. The presence of 'Doc.Trojan.Ayam-1' from ClamAV further confirms its malicious nature.

Heuristics 8

ClamAV: Doc.Trojan.Ayam-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Trojan.Ayam-1
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `c1fd06a9f67c86efc9a40faead8db926a9be289a065455a3f6c2f4603775006e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2873 bytes
Detection ClamAV: Doc.Trojan.Ayam-1 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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