tofsee | 4ffd8a5153b680b86b258bde87319885182c5e078cc0c0b16ab64009f7c69979

Analysis

max time kernel
146s
max time network
152s
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, 06:59

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General

Target
file.exe
Size 276KB
Sample221202-hr4jfsge3s
SHA256 4ffd8a5153b680b86b258bde87319885182c5e078cc0c0b16ab64009f7c69979
MD5 8861c3fedd83a41ca2637215c3bea553
SHA1 9394b1527afa8de77c962e0895c681819cb2a529
SHA512 f1e21803aee16d146737284e491685e084b3d0a65e42986d4a4c5233f4860d309e7aa12cd8516baca7ad9384dd8ac43f67fdd2866e7e4b453b184e458eb87653
SSDEEP 3072:exZL86CsL1KL6+tq5qt0OETP2F4HaNMX027CP1JTJbLCrhIh3eGjMgG1ao5Lk:NVsLML6+nt07J8OrOHNPSuRjMgU
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
4260	ynbyrxtw.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
4488	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\zdofobfr\ImagePath = "C:\\Windows\\SysWOW64\\zdofobfr\\ynbyrxtw.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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	file.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4260 set thread context of 2188	4260	ynbyrxtw.exe	99

Launches sc.exe 3 IoCs

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

pid	Process
2636	sc.exe
2364	sc.exe
2836	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
4148	1688	WerFault.exe	81
3604	4260	WerFault.exe	98

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1688 wrote to memory of 2264	1688	file.exe	83
PID 1688 wrote to memory of 2264	1688	file.exe	83
PID 1688 wrote to memory of 2264	1688	file.exe	83
PID 1688 wrote to memory of 4964	1688	file.exe	85
PID 1688 wrote to memory of 4964	1688	file.exe	85
PID 1688 wrote to memory of 4964	1688	file.exe	85
PID 1688 wrote to memory of 2636	1688	file.exe	87
PID 1688 wrote to memory of 2636	1688	file.exe	87
PID 1688 wrote to memory of 2636	1688	file.exe	87
PID 1688 wrote to memory of 2364	1688	file.exe	89
PID 1688 wrote to memory of 2364	1688	file.exe	89
PID 1688 wrote to memory of 2364	1688	file.exe	89
PID 1688 wrote to memory of 2836	1688	file.exe	91
PID 1688 wrote to memory of 2836	1688	file.exe	91
PID 1688 wrote to memory of 2836	1688	file.exe	91
PID 1688 wrote to memory of 4488	1688	file.exe	93
PID 1688 wrote to memory of 4488	1688	file.exe	93
PID 1688 wrote to memory of 4488	1688	file.exe	93
PID 4260 wrote to memory of 2188	4260	ynbyrxtw.exe	99
PID 4260 wrote to memory of 2188	4260	ynbyrxtw.exe	99
PID 4260 wrote to memory of 2188	4260	ynbyrxtw.exe	99
PID 4260 wrote to memory of 2188	4260	ynbyrxtw.exe	99
PID 4260 wrote to memory of 2188	4260	ynbyrxtw.exe	99

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:1688
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zdofobfr\
  2⤵
  PID:2264
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ynbyrxtw.exe" C:\Windows\SysWOW64\zdofobfr\
  2⤵
  PID:4964
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create zdofobfr binPath= "C:\Windows\SysWOW64\zdofobfr\ynbyrxtw.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2636
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description zdofobfr "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2364
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start zdofobfr
  2⤵
  - Launches sc.exe
  PID:2836
- 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:4488
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1688 -s 1036
  2⤵
  - Program crash
  PID:4148

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 188 -p 1688 -ip 1688
1⤵
PID:788

C:\Windows\SysWOW64\zdofobfr\ynbyrxtw.exe
C:\Windows\SysWOW64\zdofobfr\ynbyrxtw.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4260
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:2188
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4260 -s 528
  2⤵
  - Program crash
  PID:3604

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4260 -ip 4260
1⤵
PID:2744

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

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Downloads

ynbyrxtw.exe

Path C:\Users\Admin\AppData\Local\Temp\ynbyrxtw.exe
Size 13.6MB
SHA256 9d7f26e533bdfb97ca4f449693fa49398b283a2bf30385142cfc240878ce54d8
MD5 1bbab25ed7b74888765956cfcabe5df4
SHA1 215a40a12494ccf963a9bd32e8e45fafa59dd0cb
SHA512 4ab8bd0afb000115a2b647511d38d309736009faf3b9a3df889fa838ba00e4c58e2312092c43835c8033538c1959178807fb84b634dc86d679bc8319f391ffd3
SSDEEP 3072:1xZL86CsL1KL6+tq5qt0OETP2F4HaNMX027CP1JTJbLCrhIh3eGjMgG1ao5Lkmm+:WVsLML6+nt07J8OrOHNPSuRjMgU
MD5 SHA1 SHA512 SSDEEP

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ynbyrxtw.exe

Path C:\Windows\SysWOW64\zdofobfr\ynbyrxtw.exe
Size 13.6MB
SHA256 9d7f26e533bdfb97ca4f449693fa49398b283a2bf30385142cfc240878ce54d8
MD5 1bbab25ed7b74888765956cfcabe5df4
SHA1 215a40a12494ccf963a9bd32e8e45fafa59dd0cb
SHA512 4ab8bd0afb000115a2b647511d38d309736009faf3b9a3df889fa838ba00e4c58e2312092c43835c8033538c1959178807fb84b634dc86d679bc8319f391ffd3
SSDEEP 3072:1xZL86CsL1KL6+tq5qt0OETP2F4HaNMX027CP1JTJbLCrhIh3eGjMgG1ao5Lkmm+:WVsLML6+nt07J8OrOHNPSuRjMgU
MD5 SHA1 SHA512 SSDEEP

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memory/1688-133-0x0000000000580000-0x0000000000593000-memory.dmp

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memory/1688-134-0x0000000000400000-0x000000000044A000-memory.dmp

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memory/1688-144-0x0000000000400000-0x000000000044A000-memory.dmp

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memory/1688-132-0x0000000000637000-0x000000000064C000-memory.dmp

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memory/1688-141-0x0000000000580000-0x0000000000593000-memory.dmp

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memory/2188-146-0x00000000009D0000-0x00000000009E5000-memory.dmp

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memory/2188-152-0x00000000009D0000-0x00000000009E5000-memory.dmp

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memory/2188-151-0x00000000009D0000-0x00000000009E5000-memory.dmp

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memory/4260-149-0x00000000005C2000-0x00000000005D7000-memory.dmp

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memory/4260-150-0x0000000000400000-0x000000000044A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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