Office (OLE) malware analysis — malicious · c8103c5b15fa7856

MALICIOUS

Office (OLE)

201.0 KB Created: 2010-04-27 06:25:00 Authoring application: Microsoft Word 8.0

MD5: 149a14dd9265d789ddc84d07de6eccd1 SHA-1: 3a602cfe515a5357b93301ca33637f7d97fd5959 SHA-256: c8103c5b15fa7856dcd720f02c2bfaa76d149926bb2e3fd094182be012404afb

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an OLE document containing VBA macros, specifically triggering AutoOpen and Document_Open, indicating an attempt to execute malicious code upon opening. ClamAV detections identify it as 'Doc.Trojan.Xaler-1'. The document body presents itself as a statistical report from the North Kazakhstan Regional Statistics Department, likely a lure to encourage the user to enable macros. No scripts were extracted, but the presence of VBA macros and the ClamAV detection strongly suggest a macro-based malware delivery.

Heuristics 6

ClamAV: Doc.Trojan.Xaler-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Trojan.Xaler-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
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
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` `a7bf1cd26580bf675fb56c5dfccc02d3f121993c4f3e1a631d0d5c407b0cf476`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	254791 bytes
Detection ClamAV: Doc.Trojan.Xaler-1 Obfuscation or payload: likely Carved artifact contains 10 Chr/ChrW string-construction calls.

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