d8792a203a660226a87b2991593cdc2ba8499ba5e54f4db34661b9cb956b03d9

General

Target

Responder.Pdf _____________________________________________________________.exe
Size

531KB
MD5

400d4d727950f4d6de451115b8c4cfc1
SHA1

e97b06dc654b70c6c117e7b2e91c9916a06e85a4
SHA256

ee177b068a2ac964536637fe4f04ff2deed524e981e69f5cceb2e0dd935c3f65
SHA512

0d2d90ed3bef2f321629e63e672855ab9d4c3015970b35990147bdc14c87e657ca6c4178402f77f6e0d35ef82ce338c499b634faf928590d4717ef28d535d281
SSDEEP

6144:LUv7JBskamattpI16Mu4isYwNMQ9PRKeIXIRTjv1ECkrQUK:AvqNsieIk3v1eUf

Score

9^/10

evasion persistence ransomware trojan

Malware Config

Signatures

Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

explorer.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\hvufokus = "C:\\Windows\\egjpulec.exe"	explorer.exe

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

Responder.Pdf _____________________________________________________________.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Responder.Pdf _____________________________________________________________.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

Responder.Pdf _____________________________________________________________.exeResponder.Pdf _____________________________________________________________.exe

description	pid	process	target process
PID 4408 set thread context of 4284	4408	Responder.Pdf _____________________________________________________________.exe	Responder.Pdf _____________________________________________________________.exe
PID 4284 set thread context of 4288	4284	Responder.Pdf _____________________________________________________________.exe	explorer.exe

Drops file in Windows directory 2 IoCs

Processes:

explorer.exe

description ioc process

File opened for modification C:\Windows\egjpulec.exe explorer.exe
File created C:\Windows\egjpulec.exe explorer.exe
Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Processes:

vssadmin.exe

pid process

4516 vssadmin.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vssvc.exe

description pid process

Token: SeBackupPrivilege 3340 vssvc.exe
Token: SeRestorePrivilege 3340 vssvc.exe
Token: SeAuditPrivilege 3340 vssvc.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Responder.Pdf _____________________________________________________________.exe

pid process

4408 Responder.Pdf _____________________________________________________________.exe

description	ioc	process
File opened for modification	C:\Windows\egjpulec.exe	explorer.exe
File created	C:\Windows\egjpulec.exe	explorer.exe

pid	process
4516	vssadmin.exe

description	pid	process
Token: SeBackupPrivilege	3340	vssvc.exe
Token: SeRestorePrivilege	3340	vssvc.exe
Token: SeAuditPrivilege	3340	vssvc.exe

pid	process
4408	Responder.Pdf _____________________________________________________________.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

Responder.Pdf _____________________________________________________________.exeResponder.Pdf _____________________________________________________________.exeexplorer.exe

C:\Users\Admin\AppData\Local\Temp\Responder.Pdf _____________________________________________________________.exe
"C:\Users\Admin\AppData\Local\Temp\Responder.Pdf _____________________________________________________________.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4408

C:\Users\Admin\AppData\Local\Temp\Responder.Pdf _____________________________________________________________.exe
"C:\Users\Admin\AppData\Local\Temp\Responder.Pdf _____________________________________________________________.exe"
2⤵
- Checks whether UAC is enabled
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4284

C:\Windows\SysWOW64\explorer.exe
"C:\Windows\system32\explorer.exe"
3⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:4288

C:\Windows\SYSTEM32\vssadmin.exe
vssadmin.exe Delete Shadows /All /Quiet
4⤵
- Interacts with shadow copies
PID:4516

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3340

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

File Deletion

2

T1107

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Inhibit System Recovery

2

T1490

Replay Monitor

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Downloads

C:\ProgramData\ewosolyzuhobytal\01000000
Filesize
531KB

MD5
36ad0d6ee950275d288480e24f812bfd

SHA1
9dd2572045452dcff3bb8062314817b5b57e84b5

SHA256
d06e19904d9a5b3873ded58d05d83a9c78789935522f4b3b838d1b5d456f7e0c

SHA512
38dfdcc7841edcee3a6f08d78bbe1a1a43954c5f283996d266d9f0d0e2de66ec67e1ac5a5663ef774ba115c86a253af7586677814f7ebfa6eeb43387b2f04390

Download Submit
memory/4284-134-0x0000000000000000-mapping.dmp

Download
memory/4284-135-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/4284-137-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/4284-142-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/4288-138-0x0000000000000000-mapping.dmp

Download
memory/4288-139-0x0000000000A00000-0x0000000000A3B000-memory.dmp

Filesize
236KB

Download
memory/4288-143-0x0000000000A00000-0x0000000000A3B000-memory.dmp

Filesize
236KB

Download
memory/4288-145-0x0000000000A00000-0x0000000000A3B000-memory.dmp

Filesize
236KB

Download
memory/4516-144-0x0000000000000000-mapping.dmp

Download

description	pid	process	target process
PID 4408 wrote to memory of 4284	4408	Responder.Pdf _____________________________________________________________.exe	Responder.Pdf _____________________________________________________________.exe
PID 4408 wrote to memory of 4284	4408	Responder.Pdf _____________________________________________________________.exe	Responder.Pdf _____________________________________________________________.exe
PID 4408 wrote to memory of 4284	4408	Responder.Pdf _____________________________________________________________.exe	Responder.Pdf _____________________________________________________________.exe
PID 4408 wrote to memory of 4284	4408	Responder.Pdf _____________________________________________________________.exe	Responder.Pdf _____________________________________________________________.exe
PID 4408 wrote to memory of 4284	4408	Responder.Pdf _____________________________________________________________.exe	Responder.Pdf _____________________________________________________________.exe
PID 4408 wrote to memory of 4284	4408	Responder.Pdf _____________________________________________________________.exe	Responder.Pdf _____________________________________________________________.exe
PID 4408 wrote to memory of 4284	4408	Responder.Pdf _____________________________________________________________.exe	Responder.Pdf _____________________________________________________________.exe
PID 4408 wrote to memory of 4284	4408	Responder.Pdf _____________________________________________________________.exe	Responder.Pdf _____________________________________________________________.exe
PID 4408 wrote to memory of 4284	4408	Responder.Pdf _____________________________________________________________.exe	Responder.Pdf _____________________________________________________________.exe
PID 4408 wrote to memory of 4284	4408	Responder.Pdf _____________________________________________________________.exe	Responder.Pdf _____________________________________________________________.exe
PID 4284 wrote to memory of 4288	4284	Responder.Pdf _____________________________________________________________.exe	explorer.exe
PID 4284 wrote to memory of 4288	4284	Responder.Pdf _____________________________________________________________.exe	explorer.exe
PID 4284 wrote to memory of 4288	4284	Responder.Pdf _____________________________________________________________.exe	explorer.exe
PID 4284 wrote to memory of 4288	4284	Responder.Pdf _____________________________________________________________.exe	explorer.exe
PID 4288 wrote to memory of 4516	4288	explorer.exe	vssadmin.exe
PID 4288 wrote to memory of 4516	4288	explorer.exe	vssadmin.exe

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads