Jaff Office (OLE) / .DOC malware analysis — malicious · 848a1e0b5838e497

MALICIOUS

Office (OLE) / .DOC

92.0 KB Created: 2017-06-01 17:12:00 Authoring application: Microsoft Office Word First seen: 2022-04-11

MD5: 4d97dd29edec102b5377c7758d7be3b0 SHA-1: ddd6e51ace790f8217ac74a6788214fdec977807 SHA-256: 848a1e0b5838e497a223366c10e2cf13fb35eb61bd3f3eadfc4c2f1f587218be

402 Risk Score

Malware Insights

Jaff · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample was detected as malicious by ClamAV with the signature Doc.Downloader.Jaff-6329915-0, indicating it belongs to the Jaff family. High-severity heuristics indicate the presence of VBA macros, specifically an AutoOpen macro that references Windows Script Host and uses CreateObject and GetObject calls. The VBA script appears to be designed to download and execute a second-stage payload, a common characteristic of Jaff droppers.

Heuristics 11

ClamAV: Doc.Downloader.Jaff-6329915-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Jaff-6329915-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject call
CallByName call high OLE_VBA_CALLBYNAME

CallByName 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` `51e92178b91e219dd66f045c3d322a7720241b45b2cf94e7dd6d823d85b5a793`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	11609 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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