tofsee | b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213

Analysis

max time kernel
123s
max time network
165s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
02/12/2022, 17:36

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General

Target

b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe
Size

180KB
MD5

9ad02f7a000557841df40137de302ad7
SHA1

73a57c739a63126bf519690cbb6e5524d6cb1f47
SHA256

b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213
SHA512

510b581436db23623f228ee0a2b2ed8cb28f6fc8cbedf11243d60a3eb31ff7909dce0c3ae93ef0f913d4023807e3ff5d377b324b2c78f261997003012a91369b
SSDEEP

3072:1l4v+FlO+cPtrcfC3czXwlZqJwmHDquZfFrvQKvu5aLMN4yN6sZqJwmHDquZf+:1lkXztwYiwlZqJwmHDquZfFrvQKvu5aE

Score

10^/10

tofsee persistence trojan

Malware Config

Extracted

Family

tofsee

89.149.236.147

188.165.132.183

rgtryhbgddtyh.biz

wertdghbyrukl.ch

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee

Executes dropped EXE 2 IoCs

pid	Process
1908	ulxn.exe
1364	ulxn.exe

Deletes itself 1 IoCs

pid	Process
1912	cmd.exe

Loads dropped DLL 2 IoCs

pid	Process
344	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe
344	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Windows\CurrentVersion\Run\MSConfig = "\"C:\\Users\\Admin\\ulxn.exe\" /r"	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1708 set thread context of 344	1708	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	28
PID 1908 set thread context of 1364	1908	ulxn.exe	30
PID 1364 set thread context of 1128	1364	ulxn.exe	31

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 1708 wrote to memory of 344	1708	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	28
PID 1708 wrote to memory of 344	1708	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	28
PID 1708 wrote to memory of 344	1708	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	28
PID 1708 wrote to memory of 344	1708	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	28
PID 1708 wrote to memory of 344	1708	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	28
PID 1708 wrote to memory of 344	1708	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	28
PID 1708 wrote to memory of 344	1708	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	28
PID 1708 wrote to memory of 344	1708	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	28
PID 1708 wrote to memory of 344	1708	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	28
PID 1708 wrote to memory of 344	1708	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	28
PID 344 wrote to memory of 1908	344	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	29
PID 344 wrote to memory of 1908	344	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	29
PID 344 wrote to memory of 1908	344	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	29
PID 344 wrote to memory of 1908	344	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	29
PID 1908 wrote to memory of 1364	1908	ulxn.exe	30
PID 1908 wrote to memory of 1364	1908	ulxn.exe	30
PID 1908 wrote to memory of 1364	1908	ulxn.exe	30
PID 1908 wrote to memory of 1364	1908	ulxn.exe	30
PID 1908 wrote to memory of 1364	1908	ulxn.exe	30
PID 1908 wrote to memory of 1364	1908	ulxn.exe	30
PID 1908 wrote to memory of 1364	1908	ulxn.exe	30
PID 1908 wrote to memory of 1364	1908	ulxn.exe	30
PID 1908 wrote to memory of 1364	1908	ulxn.exe	30
PID 1908 wrote to memory of 1364	1908	ulxn.exe	30
PID 1364 wrote to memory of 1128	1364	ulxn.exe	31
PID 1364 wrote to memory of 1128	1364	ulxn.exe	31
PID 1364 wrote to memory of 1128	1364	ulxn.exe	31
PID 1364 wrote to memory of 1128	1364	ulxn.exe	31
PID 1364 wrote to memory of 1128	1364	ulxn.exe	31
PID 1364 wrote to memory of 1128	1364	ulxn.exe	31
PID 344 wrote to memory of 1912	344	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	32
PID 344 wrote to memory of 1912	344	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	32
PID 344 wrote to memory of 1912	344	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	32
PID 344 wrote to memory of 1912	344	b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe	32

C:\Users\Admin\AppData\Local\Temp\b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe
"C:\Users\Admin\AppData\Local\Temp\b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1708
- C:\Users\Admin\AppData\Local\Temp\b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe
  "C:\Users\Admin\AppData\Local\Temp\b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213.exe"
  2⤵
  - Loads dropped DLL
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:344
- - C:\Users\Admin\ulxn.exe
    "C:\Users\Admin\ulxn.exe" /r
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:1908
  - - C:\Users\Admin\ulxn.exe
      "C:\Users\Admin\ulxn.exe" /r
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious use of WriteProcessMemory
      PID:1364
    - - C:\Windows\SysWOW64\svchost.exe
        
        svchost.exe
        5⤵
        
        PID:1128
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\3620.bat" "
    3⤵
    - Deletes itself
    PID:1912

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\3620.bat

Filesize
135B

MD5
24b777478a14cf527d10f71ea8058cad

SHA1
52e2ef197753d4256c037e7fbbbf56cb48aa2d79

SHA256
dc2a2fc30eb20ab79a3c5c5806445ca8bd786b4561e20d5db1af62c0f101fdb3

SHA512
abd4a959985839c4be74a52c413a038bb2138fc18cbf967f84227f10e9dc8cd24ef2653829900fabed1840222d7d67486a74d4ece193f903475c23f6d47f0587

Download Submit
C:\Users\Admin\ulxn.exe

Filesize
180KB

MD5
9ad02f7a000557841df40137de302ad7

SHA1
73a57c739a63126bf519690cbb6e5524d6cb1f47

SHA256
b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213

SHA512
510b581436db23623f228ee0a2b2ed8cb28f6fc8cbedf11243d60a3eb31ff7909dce0c3ae93ef0f913d4023807e3ff5d377b324b2c78f261997003012a91369b

Download Submit
C:\Users\Admin\ulxn.exe

Filesize
180KB

MD5
9ad02f7a000557841df40137de302ad7

SHA1
73a57c739a63126bf519690cbb6e5524d6cb1f47

SHA256
b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213

SHA512
510b581436db23623f228ee0a2b2ed8cb28f6fc8cbedf11243d60a3eb31ff7909dce0c3ae93ef0f913d4023807e3ff5d377b324b2c78f261997003012a91369b

Download Submit
C:\Users\Admin\ulxn.exe

Filesize
180KB

MD5
9ad02f7a000557841df40137de302ad7

SHA1
73a57c739a63126bf519690cbb6e5524d6cb1f47

SHA256
b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213

SHA512
510b581436db23623f228ee0a2b2ed8cb28f6fc8cbedf11243d60a3eb31ff7909dce0c3ae93ef0f913d4023807e3ff5d377b324b2c78f261997003012a91369b

Download Submit
\Users\Admin\ulxn.exe

Filesize
180KB

MD5
9ad02f7a000557841df40137de302ad7

SHA1
73a57c739a63126bf519690cbb6e5524d6cb1f47

SHA256
b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213

SHA512
510b581436db23623f228ee0a2b2ed8cb28f6fc8cbedf11243d60a3eb31ff7909dce0c3ae93ef0f913d4023807e3ff5d377b324b2c78f261997003012a91369b

Download Submit
\Users\Admin\ulxn.exe

Filesize
180KB

MD5
9ad02f7a000557841df40137de302ad7

SHA1
73a57c739a63126bf519690cbb6e5524d6cb1f47

SHA256
b2c822b5eaef23f2e2f3c41dbe792df502c9818f85e595450b4934fffae98213

SHA512
510b581436db23623f228ee0a2b2ed8cb28f6fc8cbedf11243d60a3eb31ff7909dce0c3ae93ef0f913d4023807e3ff5d377b324b2c78f261997003012a91369b

Download Submit
memory/344-63-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/344-55-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/344-54-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/344-67-0x0000000075FF1000-0x0000000075FF3000-memory.dmp

Filesize
8KB

Download
memory/344-68-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/344-62-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/344-70-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/344-71-0x0000000000280000-0x00000000002B5000-memory.dmp

Filesize
212KB

Download
memory/344-101-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/344-60-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/344-59-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/344-57-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/1128-103-0x0000000000080000-0x00000000000A3000-memory.dmp

Filesize
140KB

Download
memory/1128-104-0x0000000000080000-0x00000000000A3000-memory.dmp

Filesize
140KB

Download
memory/1128-95-0x0000000000080000-0x00000000000A3000-memory.dmp

Filesize
140KB

Download
memory/1364-92-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/1708-65-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1908-89-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download