tofsee | ef514682a7ab092326100883aa5a4101cb49a2054f538e3731d80c19e065f016

Analysis

max time kernel
146s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
02/12/2022, 10:51

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
file.exe
Size 350KB
Sample221202-mxvkysdg7z
SHA256 ef514682a7ab092326100883aa5a4101cb49a2054f538e3731d80c19e065f016
MD5 64b84c266e164427f5ff999f0852817c
SHA1 2ac627bc23ec6669c2d8a95f6c3f35c6e1e753a9
SHA512 f1e36be5e459c71eef8c3880d3cb905bf7f4f909fe00bafb255b45e89b1657cbb3cb6596ffe91751fe690dd7d1923ad8884a4198813ce4a0253ea4025c9ff69b
SSDEEP 6144:Y825LbuPCD71fzEEtPBYNd2LNDRyjkuRjMgU:Y7nuKRlRKd2RDA1RQg
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

svartalfheim.top
jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
2188	jzfmrdhw.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
176	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\zsvpnckr\ImagePath = "C:\\Windows\\SysWOW64\\zsvpnckr\\jzfmrdhw.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	file.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2188 set thread context of 2712	2188	jzfmrdhw.exe	96

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
1776	sc.exe
3444	sc.exe
2012	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
3664	2992	WerFault.exe	79
2568	2188	WerFault.exe	90

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2992 wrote to memory of 4944	2992	file.exe	80
PID 2992 wrote to memory of 4944	2992	file.exe	80
PID 2992 wrote to memory of 4944	2992	file.exe	80
PID 2992 wrote to memory of 4936	2992	file.exe	82
PID 2992 wrote to memory of 4936	2992	file.exe	82
PID 2992 wrote to memory of 4936	2992	file.exe	82
PID 2992 wrote to memory of 3444	2992	file.exe	84
PID 2992 wrote to memory of 3444	2992	file.exe	84
PID 2992 wrote to memory of 3444	2992	file.exe	84
PID 2992 wrote to memory of 2012	2992	file.exe	86
PID 2992 wrote to memory of 2012	2992	file.exe	86
PID 2992 wrote to memory of 2012	2992	file.exe	86
PID 2992 wrote to memory of 1776	2992	file.exe	88
PID 2992 wrote to memory of 1776	2992	file.exe	88
PID 2992 wrote to memory of 1776	2992	file.exe	88
PID 2992 wrote to memory of 176	2992	file.exe	91
PID 2992 wrote to memory of 176	2992	file.exe	91
PID 2992 wrote to memory of 176	2992	file.exe	91
PID 2188 wrote to memory of 2712	2188	jzfmrdhw.exe	96
PID 2188 wrote to memory of 2712	2188	jzfmrdhw.exe	96
PID 2188 wrote to memory of 2712	2188	jzfmrdhw.exe	96
PID 2188 wrote to memory of 2712	2188	jzfmrdhw.exe	96
PID 2188 wrote to memory of 2712	2188	jzfmrdhw.exe	96

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2992
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zsvpnckr\
  2⤵
  PID:4944
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jzfmrdhw.exe" C:\Windows\SysWOW64\zsvpnckr\
  2⤵
  PID:4936
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create zsvpnckr binPath= "C:\Windows\SysWOW64\zsvpnckr\jzfmrdhw.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:3444
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description zsvpnckr "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2012
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start zsvpnckr
  2⤵
  - Launches sc.exe
  PID:1776
- C:\Windows\SysWOW64\netsh.exe
  "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
  2⤵
  - Modifies Windows Firewall
  PID:176
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2992 -s 1160
  2⤵
  - Program crash
  PID:3664

C:\Windows\SysWOW64\zsvpnckr\jzfmrdhw.exe
C:\Windows\SysWOW64\zsvpnckr\jzfmrdhw.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2188
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:2712
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2188 -s 556
  2⤵
  - Program crash
  PID:2568

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2992 -ip 2992
1⤵
PID:3764

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 2188 -ip 2188
1⤵
PID:2272

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

New Service

T1050

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

New Service

T1050

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

jzfmrdhw.exe

Path C:\Users\Admin\AppData\Local\Temp\jzfmrdhw.exe
Size 11.7MB
SHA256 39a9b786df0ddf55a0646de35f970d4e08e44aa1a631a802cc83ac73bd5c0195
MD5 88fd4233bb42bd785fad42b5f0f7691c
SHA1 7013e45617bfa43be8c4b6b4f7c99bdba2d25053
SHA512 71f923b702c7f68df63667f796819381847c4ebe627170855d47b41b4e68eb8baaf82fb3c9e2c6a240789ece23be133317556ac61583a23329aa1a8a80eb96f9
SSDEEP 6144:b825LbuPCD71fzEEtPBYNd2LNDRyjkuRjMgU:b7nuKRlRKd2RDA1RQg
MD5 SHA1 SHA512 SSDEEP

Submit Download

jzfmrdhw.exe

Path C:\Windows\SysWOW64\zsvpnckr\jzfmrdhw.exe
Size 11.7MB
SHA256 39a9b786df0ddf55a0646de35f970d4e08e44aa1a631a802cc83ac73bd5c0195
MD5 88fd4233bb42bd785fad42b5f0f7691c
SHA1 7013e45617bfa43be8c4b6b4f7c99bdba2d25053
SHA512 71f923b702c7f68df63667f796819381847c4ebe627170855d47b41b4e68eb8baaf82fb3c9e2c6a240789ece23be133317556ac61583a23329aa1a8a80eb96f9
SSDEEP 6144:b825LbuPCD71fzEEtPBYNd2LNDRyjkuRjMgU:b7nuKRlRKd2RDA1RQg
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/2188-151-0x0000000000400000-0x000000000045D000-memory.dmp

Download

memory/2188-150-0x0000000000552000-0x0000000000567000-memory.dmp

Download

memory/2712-153-0x0000000000520000-0x0000000000535000-memory.dmp

Download

memory/2712-152-0x0000000000520000-0x0000000000535000-memory.dmp

Download

memory/2712-147-0x0000000000520000-0x0000000000535000-memory.dmp

Download

memory/2992-140-0x0000000000757000-0x000000000076C000-memory.dmp

Download

memory/2992-133-0x0000000000570000-0x0000000000583000-memory.dmp

Download

memory/2992-145-0x0000000000400000-0x000000000045D000-memory.dmp

Download

memory/2992-134-0x0000000000400000-0x000000000045D000-memory.dmp

Download

memory/2992-132-0x0000000000757000-0x000000000076C000-memory.dmp

Download

memory/2992-141-0x0000000000570000-0x0000000000583000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads