remcos | fa167d133cb53da59f334ef6b12b264ef4e716a595084b6f922c4e447ea3def0

Analysis

max time kernel
149s
max time network
136s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
28-10-2022 13:39

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General

Target

Fully Singed Aggrement.xlsx
Size

742KB
MD5

f7afc6233a1a8e0607449a7552748722
SHA1

2c448ddfddb4b1c0481698d5181b6295633e1777
SHA256

fa167d133cb53da59f334ef6b12b264ef4e716a595084b6f922c4e447ea3def0
SHA512

2609c7ff2590ab5a1987462045b6e92188d52724fc0ddb91f6365e0446ccf2c9381de014893a9b1f77a454967de1e128aae725b6e3be99474d2b8c3e60cc3a51
SSDEEP

12288:38TesV8h7Hsh1mYDQlH4Fg4c6E3/pJ+QBC81JdzBffAHmZ76WW+y6ATWDmDjiYj:3OEzsh1msQlH74YpMiC81rJbbATb1j

Score

10^/10

remcos xp persistence rat

Malware Config

Extracted

Family

remcos

Botnet

xpremcuz300622.ddns.net:3542

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
oos.exe
delete_file
false
hide_file
true
hide_keylog_file
false
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Remcos-MMP2I7
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
kkl
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Blocklisted process makes network request 1 IoCs

Processes:

EQNEDT32.EXE

flow pid process

1 1076 EQNEDT32.EXE
Downloads MZ/PE file
Executes dropped EXE 4 IoCs

Processes:

JEF.exeJEF.exeoos.exeoos.exe

pid process

1724 JEF.exe
1992 JEF.exe
1972 oos.exe
1704 oos.exe
Loads dropped DLL 4 IoCs

Processes:

EQNEDT32.EXEcmd.exe

pid process

1076 EQNEDT32.EXE
1076 EQNEDT32.EXE
544 cmd.exe
544 cmd.exe

flow	pid	process
1	1076	EQNEDT32.EXE

pid	process
1724	JEF.exe
1992	JEF.exe
1972	oos.exe
1704	oos.exe

pid	process
1076	EQNEDT32.EXE
1076	EQNEDT32.EXE
544	cmd.exe
544	cmd.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

JEF.exeoos.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\	JEF.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	JEF.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\	JEF.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	JEF.exe
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\	oos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	oos.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\	oos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	oos.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

JEF.exeoos.exe

description pid process target process

PID 1724 set thread context of 1992 1724 JEF.exe JEF.exe
PID 1972 set thread context of 1704 1972 oos.exe oos.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry
T1012

System Information Discovery
T1082

Processes:

EXCEL.EXE

description ioc process

Key opened \REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor EXCEL.EXE
Launches Equation Editor 1 TTPs 1 IoCs
Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.
exploit

Exploitation for Client Execution
T1203

Processes:

EQNEDT32.EXE

pid process

1076 EQNEDT32.EXE

description	pid	process	target process
PID 1724 set thread context of 1992	1724	JEF.exe	JEF.exe
PID 1972 set thread context of 1704	1972	oos.exe	oos.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor	EXCEL.EXE

pid	process
1076	EQNEDT32.EXE

Modifies Internet Explorer settings 1 TTPs 31 IoCs

adware spyware

Modify Registry

T1112

Processes:

EXCEL.EXE

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell\edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\WINWORD.EXE\" /n \"%1\""	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell\edit	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell\edit\command	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor\shell	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor\shell\edit\ = "&Edit"	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor\shell\edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\WINWORD.EXE\" /n \"%1\""	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor\shell\edit\COMMAND	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor\shell\edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor\shell\edit	EXCEL.EXE
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor\shell\edit\command\command = 7800620027004200560035002100210021002100210021002100210021004d004b004b0053006b0057004f0052004400460069006c00650073003e00620069002400540021005600210030005a003d007b0050006b00300076006d007e0041005a00750020002f006e002000220025003100220000000000	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell\edit\COMMAND	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell\edit\ = "&Edit"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor\shell\edit\command	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell\edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor\shell	EXCEL.EXE
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell\edit\command\command = 7800620027004200560035002100210021002100210021002100210021004d004b004b0053006b0057004f0052004400460069006c00650073003e00620069002400540021005600210030005a003d007b0050006b00300076006d007e0041005a00750020002f006e002000220025003100220000000000	EXCEL.EXE

Modifies registry class 64 IoCs

Processes:

EXCEL.EXE

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Word\shell\edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\WINWORD.EXE\" /n \"%1\""	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Excel\shell\edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\EXCEL.EXE\" /dde"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\shell\Print	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Excel\shell\edit\ddeexec\application	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Excel.exe\shell\edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\EXCEL.EXE\" /dde"	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Excel\shell\edit\ = "&Open"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Publisher\shell\edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\MSPub.exe	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\shell\Edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\msohtmed.exe\" %1"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\WinWord.exe\shell\edit	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\WinWord.exe\shell\edit\ = "&Open"	EXCEL.EXE
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\WinWord.exe\shell\edit\command\command = 7800620027004200560035002100210021002100210021002100210021004d004b004b0053006b0057004f0052004400460069006c00650073003e00620069002400540021005600210030005a003d007b0050006b00300076006d007e0041005a00750020002f006e002000220025003100220000000000	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\MSPub.exe\shell\edit\command	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\shell\Print	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\MSPub.exe\shell\edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\MSPUB.EXE\" %1"	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\DefaultIcon\ = "\"%1\""	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{42042206-2D85-11D3-8CFF-005004838597}\InprocServer32\ThreadingModel = "Apartment"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\WinWord.exe	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe\shell\edit	EXCEL.EXE
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Excel\shell\edit\command\command = 7800620027004200560035002100210021002100210021002100210021004d004b004b0053006b0045005800430045004c00460069006c00650073003e00560069006a00710042006f006600280059003800270077002100460049006400310067004c00510020002f0064006400650000000000	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe\shell\edit\ddeexec\ = "[open(\"%1\")]"	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\shell\Print\ = "&Print"	EXCEL.EXE
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Excel\shell\edit\command\command = 7800620027004200560035002100210021002100210021002100210021004d004b004b0053006b0045005800430045004c00460069006c00650073003e00560069006a00710042006f006600280059003800270077002100460049006400310067004c00510020002f0064006400650000000000	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\MSPub.exe\shell\edit\ = "&Open"	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\shellex\IconHandler\ = "{42042206-2D85-11D3-8CFF-005004838597}"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\WinWord.exe\shell\edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Excel.exe\shell\edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Excel\shell\edit\ddeexec\application	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\shellex\IconHandler\ = "{42042206-2D85-11D3-8CFF-005004838597}"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\shell\Edit\command	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\DefaultIcon	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList	EXCEL.EXE
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\WinWord.exe\shell\edit\command\command = 7800620027004200560035002100210021002100210021002100210021004d004b004b0053006b0057004f0052004400460069006c00650073003e00620069002400540021005600210030005a003d007b0050006b00300076006d007e0041005a00750020002f006e002000220025003100220000000000	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\shell\Print\command	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe\shell\edit\ddeexec\topic\ = "system"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\WinWord.exe\shell\edit\command	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\shell	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\shell\Edit\ = "&Edit"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Word\shell\edit\command	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\shell\Edit\command	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\shell\Print\ = "&Print"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Word\shell\edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe\shell\edit\ddeexec\application	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\shell\Edit\command	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Excel	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe\shell\edit\ddeexec	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Excel	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Publisher	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\shell\Print\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\msohtmed.exe\" /p %1"	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Excel\shell\edit\ddeexec\application\ = "Excel"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\WinWord.exe\shell\edit\command	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Excel\shell\edit\ddeexec\topic	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Excel.exe\shell\edit\ddeexec\application	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\shell\Edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe\shell\edit\command	EXCEL.EXE
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe\shell\edit\command\command = 7800620027004200560035002100210021002100210021002100210021004d004b004b0053006b0045005800430045004c00460069006c00650073003e00560069006a00710042006f006600280059003800270077002100460049006400310067004c00510020002f0064006400650000000000	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Excel\shell\edit\ddeexec\topic\ = "system"	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{42042206-2D85-11D3-8CFF-005004838597}\Version\14\ = "C:\\Program Files (x86)\\Microsoft Office\\Office14\\msohtmed.exe"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Excel\shell\edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Excel\shell\edit\ddeexec	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\ShellEx	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1500 EXCEL.EXE
Suspicious use of SetWindowsHookEx 4 IoCs

Processes:

EXCEL.EXEoos.exe

pid process

1500 EXCEL.EXE
1500 EXCEL.EXE
1500 EXCEL.EXE
1704 oos.exe

pid	process
1500	EXCEL.EXE

pid	process
1500	EXCEL.EXE
1500	EXCEL.EXE
1500	EXCEL.EXE
1704	oos.exe

Suspicious use of WriteProcessMemory 42 IoCs

Processes:

EQNEDT32.EXEJEF.exeJEF.exeWScript.execmd.exeoos.exe

description	pid	process	target process
PID 1076 wrote to memory of 1724	1076	EQNEDT32.EXE	JEF.exe
PID 1076 wrote to memory of 1724	1076	EQNEDT32.EXE	JEF.exe
PID 1076 wrote to memory of 1724	1076	EQNEDT32.EXE	JEF.exe
PID 1076 wrote to memory of 1724	1076	EQNEDT32.EXE	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1724 wrote to memory of 1992	1724	JEF.exe	JEF.exe
PID 1992 wrote to memory of 2012	1992	JEF.exe	WScript.exe
PID 1992 wrote to memory of 2012	1992	JEF.exe	WScript.exe
PID 1992 wrote to memory of 2012	1992	JEF.exe	WScript.exe
PID 1992 wrote to memory of 2012	1992	JEF.exe	WScript.exe
PID 2012 wrote to memory of 544	2012	WScript.exe	cmd.exe
PID 2012 wrote to memory of 544	2012	WScript.exe	cmd.exe
PID 2012 wrote to memory of 544	2012	WScript.exe	cmd.exe
PID 2012 wrote to memory of 544	2012	WScript.exe	cmd.exe
PID 544 wrote to memory of 1972	544	cmd.exe	oos.exe
PID 544 wrote to memory of 1972	544	cmd.exe	oos.exe
PID 544 wrote to memory of 1972	544	cmd.exe	oos.exe
PID 544 wrote to memory of 1972	544	cmd.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe
PID 1972 wrote to memory of 1704	1972	oos.exe	oos.exe

C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde "C:\Users\Admin\AppData\Local\Temp\Fully Singed Aggrement.xlsx"
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Modifies registry class
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
PID:1500

C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
"C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
1⤵
- Blocklisted process makes network request
- Loads dropped DLL
- Launches Equation Editor
- Suspicious use of WriteProcessMemory
PID:1076

C:\Users\Admin\AppData\Roaming\JEF.exe
C:\Users\Admin\AppData\Roaming\JEF.exe
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1724

C:\Users\Admin\AppData\Roaming\JEF.exe
"C:\Users\Admin\AppData\Roaming\JEF.exe"
3⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1992

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
4⤵
- Suspicious use of WriteProcessMemory
PID:2012

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\oos.exe"
5⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:544

C:\Users\Admin\AppData\Roaming\oos.exe
C:\Users\Admin\AppData\Roaming\oos.exe
6⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1972

C:\Users\Admin\AppData\Roaming\oos.exe
"C:\Users\Admin\AppData\Roaming\oos.exe"
7⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetWindowsHookEx
PID:1704

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Exploitation for Client Execution

T1203

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Query Registry

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.vbs
Filesize
398B

MD5
a5d3440f90cbfae712166e20870eaed7

SHA1
cc1e1a2945eb2ad475234344f7527ad9e9873647

SHA256
960a570da95b8d16809cbcc18e8ca4d81e16cb666354ddc1d572daf93f291f02

SHA512
d3136a280fbb326ccc5cb5ab1214aed8ccd6baa7f3f89ef9e0b5bf391a957dab2c121640bb056e6cbda0594f83133c4dbb4e1e2f0e290b44a401cd2cf8cfd4aa

Download Submit
C:\Users\Admin\AppData\Roaming\JEF.exe
Filesize
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
C:\Users\Admin\AppData\Roaming\JEF.exe
Filesize
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
C:\Users\Admin\AppData\Roaming\JEF.exe
Filesize
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
\Users\Admin\AppData\Roaming\JEF.exe
Filesize
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
\Users\Admin\AppData\Roaming\JEF.exe
Filesize
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
\Users\Admin\AppData\Roaming\oos.exe
Filesize
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
\Users\Admin\AppData\Roaming\oos.exe
Filesize
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
memory/544-94-0x0000000000000000-mapping.dmp

Download
memory/1500-122-0x00000000727FD000-0x0000000072808000-memory.dmp

Filesize
44KB

Download
memory/1500-69-0x00000000727FD000-0x0000000072808000-memory.dmp

Filesize
44KB

Download
memory/1500-121-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1500-54-0x000000002F501000-0x000000002F504000-memory.dmp

Filesize
12KB

Download
memory/1500-58-0x0000000075B41000-0x0000000075B43000-memory.dmp

Filesize
8KB

Download
memory/1500-57-0x00000000727FD000-0x0000000072808000-memory.dmp

Filesize
44KB

Download
memory/1500-56-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1500-55-0x0000000071811000-0x0000000071813000-memory.dmp

Filesize
8KB

Download
memory/1704-120-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1704-115-0x000000000043168C-mapping.dmp

Download
memory/1704-123-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1724-67-0x0000000005030000-0x0000000005114000-memory.dmp

Filesize
912KB

Download
memory/1724-71-0x0000000005DA0000-0x0000000005E1A000-memory.dmp

Filesize
488KB

Download
memory/1724-62-0x0000000000000000-mapping.dmp

Download
memory/1724-65-0x0000000000C60000-0x0000000000D50000-memory.dmp

Filesize
960KB

Download
memory/1724-68-0x00000000005C0000-0x00000000005D6000-memory.dmp

Filesize
88KB

Download
memory/1724-70-0x00000000080C0000-0x0000000008172000-memory.dmp

Filesize
712KB

Download
memory/1972-98-0x0000000000000000-mapping.dmp

Download
memory/1972-100-0x0000000000010000-0x0000000000100000-memory.dmp

Filesize
960KB

Download
memory/1992-73-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1992-78-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1992-77-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1992-84-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1992-75-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1992-80-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1992-79-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1992-72-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1992-91-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1992-89-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1992-82-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1992-85-0x000000000043168C-mapping.dmp

Download
memory/2012-90-0x0000000000000000-mapping.dmp

Download