remcos | 8a0a6222211f0a83491ab63a17e31dd91567d51b2547009eaabbbd30a23fd696

Analysis

max time kernel
150s
max time network
127s
platform
windows7_x64
resource
win7-20220901-en
resource tags

arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
submitted
03-11-2022 15:25

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General

Target

c5706b81a1d2ee066776d358fe683c9cbf853ef3fb0ef0f8a7d86b0f84ff3044.xlsx
Size

694KB
MD5

259f46d30a2b6c8da678ce7fe4c3c679
SHA1

d9a430f7ff1e8b0ee20f80b4299e4b99776732c0
SHA256

c5706b81a1d2ee066776d358fe683c9cbf853ef3fb0ef0f8a7d86b0f84ff3044
SHA512

ec5ce338192c414fd79a1c0c936b774c92ddf87e1d7aa06fc20a2571eb006675b74101ddec7b6e5eea95298e1a1a3279a89037a4a35699cfb51159d071e759eb
SSDEEP

12288:mZknhVXxqZDzMqkOm4jsEUxkGpv2NhmLCE8XPQQkdH7pX4s2z1p4db8fdhQS:maTMI944EUxkyAhKC75ybpI9z0b+d+S

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

.NET Reactor proctector 1 IoCs

Detects an executable protected by an unregistered version of Eziriz's .NET Reactor.

Processes:

resource	yara_rule
behavioral1/memory/1488-68-0x0000000000910000-0x0000000000926000-memory.dmp	net_reactor

Blocklisted process makes network request 1 IoCs

Processes:

EQNEDT32.EXE

flow pid process

1 296 EQNEDT32.EXE
Downloads MZ/PE file
Executes dropped EXE 4 IoCs

Processes:

JEF.exeJEF.exeoos.exeoos.exe

pid process

1488 JEF.exe
756 JEF.exe
1628 oos.exe
1608 oos.exe
Loads dropped DLL 4 IoCs

Processes:

EQNEDT32.EXEcmd.exe

pid process

296 EQNEDT32.EXE
296 EQNEDT32.EXE
1324 cmd.exe
1324 cmd.exe

flow	pid	process
1	296	EQNEDT32.EXE

pid	process
1488	JEF.exe
756	JEF.exe
1628	oos.exe
1608	oos.exe

pid	process
296	EQNEDT32.EXE
296	EQNEDT32.EXE
1324	cmd.exe
1324	cmd.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

oos.exeJEF.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	oos.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\	JEF.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\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-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\	oos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\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

Suspicious use of SetThreadContext 2 IoCs

Processes:

JEF.exeoos.exe

description pid process target process

PID 1488 set thread context of 756 1488 JEF.exe JEF.exe
PID 1628 set thread context of 1608 1628 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

296 EQNEDT32.EXE

description	pid	process	target process
PID 1488 set thread context of 756	1488	JEF.exe	JEF.exe
PID 1628 set thread context of 1608	1628	oos.exe	oos.exe

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

pid	process
296	EQNEDT32.EXE

Modifies Internet Explorer settings 1 TTPs 31 IoCs

adware spyware

Modify Registry

T1112

Processes:

EXCEL.EXE

description	ioc	process
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell\edit\command\command = 7800620027004200560035002100210021002100210021002100210021004d004b004b0053006b0057004f0052004400460069006c00650073003e00620069002400540021005600210030005a003d007b0050006b00300076006d007e0041005a00750020002f006e002000220025003100220000000000	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor\shell	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor\shell\edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell\edit\command	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	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	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Toolbar	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 deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default HTML Editor	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell\edit	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	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 created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor	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 HTML Editor\shell	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell\edit\COMMAND	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor	EXCEL.EXE
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
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Key created	\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 MHTML Editor\shell\edit	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Default MHTML Editor\shell\edit\ = "&Edit"	EXCEL.EXE

Modifies registry class 64 IoCs

Processes:

EXCEL.EXE

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{42042206-2D85-11D3-8CFF-005004838597}\Old Icon\htmlfile	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{42042206-2D85-11D3-8CFF-005004838597}\InprocServer32\ = "C:\\Program Files (x86)\\Microsoft Office\\Office14\\msohevi.dll"	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe\shell\edit\ddeexec\application\ = "Excel"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{42042206-2D85-11D3-8CFF-005004838597}\Old Icon\mhtmlfile	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\Microsoft Publisher\shell\edit\command	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{42042206-2D85-11D3-8CFF-005004838597}	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Publisher\shell\edit\ = "&Open"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\MSPub.exe\shell\edit\command	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\shell\Print\command	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\WinWord.exe\shell\edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\WINWORD.EXE\" /n \"%1\""	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Excel\shell\edit\ddeexec\application\ = "Excel"	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\htmlfile\shell\Print	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\mhtmlfile\shell\Edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\msohtmed.exe\" %1"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\shellex\IconHandler	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
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe\shell\edit\ddeexec\application	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\MSPub.exe\shell\edit	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\shellex\IconHandler\ = "{42042206-2D85-11D3-8CFF-005004838597}"	EXCEL.EXE
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Publisher\shell\edit\command\command = 7800620027004200560035002100210021002100210021002100210021004d004b004b0053006b005000750062005000720069006d006100720079003e00520024006e0075006a0053005700460065003f007d0061004c00720052007000390078004000570020002500310000000000	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\MSPub.exe	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Excel\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\ddeexec\ = "[open(\"%1\")]"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Excel.exe\shell\edit\ddeexec	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\MSPub.exe\shell\edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\MSPUB.EXE\" %1"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\DefaultIcon	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\shell\Edit\command	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Excel\shell\edit\ = "&Open"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\WinWord.exe\shell\edit\command	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 (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe\shell\edit\command\command = 7800620027004200560035002100210021002100210021002100210021004d004b004b0053006b0045005800430045004c00460069006c00650073003e00560069006a00710042006f006600280059003800270077002100460049006400310067004c00510020002f0064006400650000000000	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Publisher\shell\edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\MSPUB.EXE\" %1"	EXCEL.EXE
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\shell\Edit	EXCEL.EXE
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Word\shell\edit\command\command = 7800620027004200560035002100210021002100210021002100210021004d004b004b0053006b0057004f0052004400460069006c00650073003e00620069002400540021005600210030005a003d007b0050006b00300076006d007e0041005a00750020002f006e002000220025003100220000000000	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe\shell\edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\EXCEL.EXE\" /dde"	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\Microsoft Excel\shell\edit\ddeexec\application	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Excel.exe\shell\edit\command	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Excel.exe\shell\edit\ddeexec\ = "[open(\"%1\")]"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Publisher	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\shell\Print	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Excel.exe\shell\edit\ddeexec\topic\ = "system"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Publisher	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Word\shell\edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Word\shell\edit\command	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Excel\shell\edit\ddeexec\application\ = "Excel"	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Excel.exe\shell\edit\ddeexec\topic\ = "system"	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\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\.mht\OpenWithList\WinWord.exe\shell\edit\ = "&Open"	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Microsoft Excel\shell\edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Excel.exe\shell\edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\MSPub.exe\shell\edit	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{42042206-2D85-11D3-8CFF-005004838597}\Version	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\shell	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\shell\Print\command	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\mhtmlfile\DefaultIcon\ = "\"%1\""	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.mht\OpenWithList\Excel.exe\shell\edit\ddeexec\topic	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\htmlfile\ShellEx	EXCEL.EXE
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\WinWord.exe\shell\edit\command\ = "\"C:\\Program Files (x86)\\Microsoft Office\\Office14\\WINWORD.EXE\" /n \"%1\""	EXCEL.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.htm\OpenWithList\Microsoft Excel\shell\edit\command	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1468 EXCEL.EXE
Suspicious use of SetWindowsHookEx 4 IoCs

Processes:

EXCEL.EXEoos.exe

pid process

1468 EXCEL.EXE
1468 EXCEL.EXE
1468 EXCEL.EXE
1608 oos.exe

pid	process
1468	EXCEL.EXE

pid	process
1468	EXCEL.EXE
1468	EXCEL.EXE
1468	EXCEL.EXE
1608	oos.exe

Suspicious use of WriteProcessMemory 42 IoCs

Processes:

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

description	pid	process	target process
PID 296 wrote to memory of 1488	296	EQNEDT32.EXE	JEF.exe
PID 296 wrote to memory of 1488	296	EQNEDT32.EXE	JEF.exe
PID 296 wrote to memory of 1488	296	EQNEDT32.EXE	JEF.exe
PID 296 wrote to memory of 1488	296	EQNEDT32.EXE	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 1488 wrote to memory of 756	1488	JEF.exe	JEF.exe
PID 756 wrote to memory of 1996	756	JEF.exe	WScript.exe
PID 756 wrote to memory of 1996	756	JEF.exe	WScript.exe
PID 756 wrote to memory of 1996	756	JEF.exe	WScript.exe
PID 756 wrote to memory of 1996	756	JEF.exe	WScript.exe
PID 1996 wrote to memory of 1324	1996	WScript.exe	cmd.exe
PID 1996 wrote to memory of 1324	1996	WScript.exe	cmd.exe
PID 1996 wrote to memory of 1324	1996	WScript.exe	cmd.exe
PID 1996 wrote to memory of 1324	1996	WScript.exe	cmd.exe
PID 1324 wrote to memory of 1628	1324	cmd.exe	oos.exe
PID 1324 wrote to memory of 1628	1324	cmd.exe	oos.exe
PID 1324 wrote to memory of 1628	1324	cmd.exe	oos.exe
PID 1324 wrote to memory of 1628	1324	cmd.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	oos.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	oos.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	oos.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	oos.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	oos.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	oos.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	oos.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	oos.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	oos.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	oos.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	oos.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	oos.exe	oos.exe
PID 1628 wrote to memory of 1608	1628	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\c5706b81a1d2ee066776d358fe683c9cbf853ef3fb0ef0f8a7d86b0f84ff3044.xlsx
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Modifies registry class
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
PID:1468

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:296

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:1488

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:756

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
4⤵
- Suspicious use of WriteProcessMemory
PID:1996

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:1324

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:1628

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:1608

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
869KB

MD5
3ba1bdbc7ffb954b938e166d6103b5ee

SHA1
17f8dc167314798defb8d59af97bc1a99df0fbed

SHA256
9340bf5ddd9a4fd65916720d08002ea3525d59178b196b4886dce646452d95a2

SHA512
7bf5a77bd129063b6f9bad7af04bfdd65060882a627fb24e4bf8fcdde5616b02c55af228530de9607ba496149e9aaad7bc890cb5ed533050e95fa22d0d7fbdb7

Download Submit
C:\Users\Admin\AppData\Roaming\JEF.exe
Filesize
869KB

MD5
3ba1bdbc7ffb954b938e166d6103b5ee

SHA1
17f8dc167314798defb8d59af97bc1a99df0fbed

SHA256
9340bf5ddd9a4fd65916720d08002ea3525d59178b196b4886dce646452d95a2

SHA512
7bf5a77bd129063b6f9bad7af04bfdd65060882a627fb24e4bf8fcdde5616b02c55af228530de9607ba496149e9aaad7bc890cb5ed533050e95fa22d0d7fbdb7

Download Submit
C:\Users\Admin\AppData\Roaming\JEF.exe
Filesize
869KB

MD5
3ba1bdbc7ffb954b938e166d6103b5ee

SHA1
17f8dc167314798defb8d59af97bc1a99df0fbed

SHA256
9340bf5ddd9a4fd65916720d08002ea3525d59178b196b4886dce646452d95a2

SHA512
7bf5a77bd129063b6f9bad7af04bfdd65060882a627fb24e4bf8fcdde5616b02c55af228530de9607ba496149e9aaad7bc890cb5ed533050e95fa22d0d7fbdb7

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
869KB

MD5
3ba1bdbc7ffb954b938e166d6103b5ee

SHA1
17f8dc167314798defb8d59af97bc1a99df0fbed

SHA256
9340bf5ddd9a4fd65916720d08002ea3525d59178b196b4886dce646452d95a2

SHA512
7bf5a77bd129063b6f9bad7af04bfdd65060882a627fb24e4bf8fcdde5616b02c55af228530de9607ba496149e9aaad7bc890cb5ed533050e95fa22d0d7fbdb7

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
869KB

MD5
3ba1bdbc7ffb954b938e166d6103b5ee

SHA1
17f8dc167314798defb8d59af97bc1a99df0fbed

SHA256
9340bf5ddd9a4fd65916720d08002ea3525d59178b196b4886dce646452d95a2

SHA512
7bf5a77bd129063b6f9bad7af04bfdd65060882a627fb24e4bf8fcdde5616b02c55af228530de9607ba496149e9aaad7bc890cb5ed533050e95fa22d0d7fbdb7

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
869KB

MD5
3ba1bdbc7ffb954b938e166d6103b5ee

SHA1
17f8dc167314798defb8d59af97bc1a99df0fbed

SHA256
9340bf5ddd9a4fd65916720d08002ea3525d59178b196b4886dce646452d95a2

SHA512
7bf5a77bd129063b6f9bad7af04bfdd65060882a627fb24e4bf8fcdde5616b02c55af228530de9607ba496149e9aaad7bc890cb5ed533050e95fa22d0d7fbdb7

Download Submit
\Users\Admin\AppData\Roaming\JEF.exe
Filesize
869KB

MD5
3ba1bdbc7ffb954b938e166d6103b5ee

SHA1
17f8dc167314798defb8d59af97bc1a99df0fbed

SHA256
9340bf5ddd9a4fd65916720d08002ea3525d59178b196b4886dce646452d95a2

SHA512
7bf5a77bd129063b6f9bad7af04bfdd65060882a627fb24e4bf8fcdde5616b02c55af228530de9607ba496149e9aaad7bc890cb5ed533050e95fa22d0d7fbdb7

Download Submit
\Users\Admin\AppData\Roaming\JEF.exe
Filesize
869KB

MD5
3ba1bdbc7ffb954b938e166d6103b5ee

SHA1
17f8dc167314798defb8d59af97bc1a99df0fbed

SHA256
9340bf5ddd9a4fd65916720d08002ea3525d59178b196b4886dce646452d95a2

SHA512
7bf5a77bd129063b6f9bad7af04bfdd65060882a627fb24e4bf8fcdde5616b02c55af228530de9607ba496149e9aaad7bc890cb5ed533050e95fa22d0d7fbdb7

Download Submit
\Users\Admin\AppData\Roaming\oos.exe
Filesize
869KB

MD5
3ba1bdbc7ffb954b938e166d6103b5ee

SHA1
17f8dc167314798defb8d59af97bc1a99df0fbed

SHA256
9340bf5ddd9a4fd65916720d08002ea3525d59178b196b4886dce646452d95a2

SHA512
7bf5a77bd129063b6f9bad7af04bfdd65060882a627fb24e4bf8fcdde5616b02c55af228530de9607ba496149e9aaad7bc890cb5ed533050e95fa22d0d7fbdb7

Download Submit
\Users\Admin\AppData\Roaming\oos.exe
Filesize
869KB

MD5
3ba1bdbc7ffb954b938e166d6103b5ee

SHA1
17f8dc167314798defb8d59af97bc1a99df0fbed

SHA256
9340bf5ddd9a4fd65916720d08002ea3525d59178b196b4886dce646452d95a2

SHA512
7bf5a77bd129063b6f9bad7af04bfdd65060882a627fb24e4bf8fcdde5616b02c55af228530de9607ba496149e9aaad7bc890cb5ed533050e95fa22d0d7fbdb7

Download Submit
memory/756-78-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/756-84-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/756-91-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/756-89-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/756-85-0x000000000043168C-mapping.dmp

Download
memory/756-72-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/756-73-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/756-75-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/756-77-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/756-82-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/756-79-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/756-80-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1324-94-0x0000000000000000-mapping.dmp

Download
memory/1468-54-0x000000002FE01000-0x000000002FE04000-memory.dmp

Filesize
12KB

Download
memory/1468-56-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1468-57-0x0000000076BA1000-0x0000000076BA3000-memory.dmp

Filesize
8KB

Download
memory/1468-55-0x0000000071CA1000-0x0000000071CA3000-memory.dmp

Filesize
8KB

Download
memory/1468-58-0x0000000072C8D000-0x0000000072C98000-memory.dmp

Filesize
44KB

Download
memory/1468-69-0x0000000072C8D000-0x0000000072C98000-memory.dmp

Filesize
44KB

Download
memory/1488-67-0x0000000004D30000-0x0000000004E08000-memory.dmp

Filesize
864KB

Download
memory/1488-65-0x0000000000DD0000-0x0000000000EAE000-memory.dmp

Filesize
888KB

Download
memory/1488-62-0x0000000000000000-mapping.dmp

Download
memory/1488-68-0x0000000000910000-0x0000000000926000-memory.dmp

Filesize
88KB

Download
memory/1488-71-0x0000000004E90000-0x0000000004F0A000-memory.dmp

Filesize
488KB

Download
memory/1488-70-0x00000000055E0000-0x0000000005692000-memory.dmp

Filesize
712KB

Download
memory/1608-115-0x000000000043168C-mapping.dmp

Download
memory/1608-120-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1608-121-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1628-98-0x0000000000000000-mapping.dmp

Download
memory/1628-100-0x0000000000C60000-0x0000000000D3E000-memory.dmp

Filesize
888KB

Download
memory/1996-90-0x0000000000000000-mapping.dmp

Download