99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010

General

Target

99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010.exe
Size

129KB
MD5

b05827b477d68c75ec09dd9c069efc25
SHA1

4a79ff851f0f88f0da4c78e73f6096534c3774d7
SHA256

99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010
SHA512

5d0420200c12ab9fab997da36b28eda51342fc4dc0bb1607dd2aa56e20df808d7d0ea36f1fd7382768a56ab5c1e3f6504032a353dcedb46f9cd1a4ead1a7bcf5
SSDEEP

3072:rhR98zd/EtzAAa1roAl4bI+m/B6SVqCgQfBUnPy8L66iiSM:rhodEt8AMrmI+m/B6SVqCgQfBUPy8L6H

Score

9^/10

persistence ransomware

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
Drops startup file 1 IoCs

Processes:

explorer.exe

description ioc process

File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dfb5f6db.exe explorer.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dfb5f6db.exe	explorer.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

explorer.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\dfb5f6d = "C:\\dfb5f6db\\dfb5f6db.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*fb5f6d = "C:\\dfb5f6db\\dfb5f6db.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\dfb5f6db = "C:\\Users\\Admin\\AppData\\Roaming\\dfb5f6db.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*fb5f6db = "C:\\Users\\Admin\\AppData\\Roaming\\dfb5f6db.exe"	explorer.exe

Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

2 ip-addr.es
5 myexternalip.com
9 myexternalip.com
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

976 vssadmin.exe
Suspicious behavior: MapViewOfSection 2 IoCs

Processes:

99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010.exeexplorer.exe

pid process

1980 99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010.exe
1976 explorer.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vssvc.exe

description pid process

Token: SeBackupPrivilege 644 vssvc.exe
Token: SeRestorePrivilege 644 vssvc.exe
Token: SeAuditPrivilege 644 vssvc.exe

flow	ioc
2	ip-addr.es
5	myexternalip.com
9	myexternalip.com

pid	process
976	vssadmin.exe

pid	process
1980	99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010.exe
1976	explorer.exe

description	pid	process
Token: SeBackupPrivilege	644	vssvc.exe
Token: SeRestorePrivilege	644	vssvc.exe
Token: SeAuditPrivilege	644	vssvc.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010.exeexplorer.exe

description	pid	process	target process
PID 1980 wrote to memory of 1976	1980	99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010.exe	explorer.exe
PID 1980 wrote to memory of 1976	1980	99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010.exe	explorer.exe
PID 1980 wrote to memory of 1976	1980	99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010.exe	explorer.exe
PID 1980 wrote to memory of 1976	1980	99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010.exe	explorer.exe
PID 1976 wrote to memory of 1536	1976	explorer.exe	svchost.exe
PID 1976 wrote to memory of 1536	1976	explorer.exe	svchost.exe
PID 1976 wrote to memory of 1536	1976	explorer.exe	svchost.exe
PID 1976 wrote to memory of 1536	1976	explorer.exe	svchost.exe
PID 1976 wrote to memory of 976	1976	explorer.exe	vssadmin.exe
PID 1976 wrote to memory of 976	1976	explorer.exe	vssadmin.exe
PID 1976 wrote to memory of 976	1976	explorer.exe	vssadmin.exe
PID 1976 wrote to memory of 976	1976	explorer.exe	vssadmin.exe

C:\Users\Admin\AppData\Local\Temp\99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010.exe
"C:\Users\Admin\AppData\Local\Temp\99cf5f08b0933da8a5785c8e8695e6afcc4975d56e986ed162ad1c9e6ec6f010.exe"
1⤵
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1980

C:\Windows\syswow64\explorer.exe
"C:\Windows\syswow64\explorer.exe"
2⤵
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1976

C:\Windows\syswow64\svchost.exe
-k netsvcs
3⤵
PID:1536

C:\Windows\syswow64\vssadmin.exe
vssadmin.exe Delete Shadows /All /Quiet
3⤵
- Interacts with shadow copies
PID:976

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:644

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

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Inhibit System Recovery

2

T1490

Replay Monitor

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Downloads

memory/976-59-0x0000000000000000-mapping.dmp

Download
memory/1536-58-0x0000000000000000-mapping.dmp

Download
memory/1536-61-0x00000000000C0000-0x00000000000E5000-memory.dmp

Filesize
148KB

Download
memory/1976-54-0x0000000000000000-mapping.dmp

Download
memory/1976-55-0x0000000075831000-0x0000000075833000-memory.dmp

Filesize
8KB

Download
memory/1976-56-0x00000000751C1000-0x00000000751C3000-memory.dmp

Filesize
8KB

Download
memory/1976-57-0x0000000000080000-0x00000000000A5000-memory.dmp

Filesize
148KB

Download

Analysis

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