c6079f689a8a692799e84ae1fbb1341d1ee5519e89cc5a622f315da8e651abeb

General

Target

csrts.exe
Size

498KB
MD5

aa877144edcef2e8d5a8d37d7ea0d4b6
SHA1

865fe61d037b67841c36468a9e7af15656621abc
SHA256

3dca9bd1af28bbf348c0562475edd60de2b5a2424e586eaf118909b013054eee
SHA512

300386cf27f163867e5448acb6119ef774d9ebf4e3702ff8ceb578477c583982151f95d21ac0ec2979b72034d51fae244eca37ba60256334cee42926cdcbad6b

Score

8^/10

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
556	updater.exe

Deletes itself 1 IoCs

pid	Process
1184	cmd.exe

Loads dropped DLL 5 IoCs

pid	Process
880	csrts.exe
556	updater.exe
556	updater.exe
556	updater.exe
556	updater.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\Mozilla Firefox\Myou.dll	updater.exe
File created	C:\Program Files\Mozilla Firefox\f‎i‎r‎e‎f‎o‎x‎.exe	updater.exe
File opened for modification	C:\Program Files\Mozilla Firefox\f‎i‎r‎e‎f‎o‎x‎.exe	updater.exe
File created	C:\Program Files\Mozilla Firefox\Myou.dll	updater.exe

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

System Information Discovery
T1082

Modifies system certificate store 2 TTPs 2 IoCs

evasion spyware trojan

Install Root Certificate

T1130

Modify Registry

T1112

description	ioc	Process
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\A8985D3A65E5E5C4B2D7D66D40C6DD2FB19C5436\Blob = 04000000010000001000000079e4a9840d7d3a96d7c04fe2434c892e0f0000000100000014000000b34ddd372ed92e8f2abfbb9e20a9d31f204f194b090000000100000034000000303206082b0601050507030106082b0601050507030206082b0601050507030406082b0601050507030306082b0601050507030814000000010000001400000003de503556d14cbb66f0a3e21b1bc397b23dd1550b00000001000000120000004400690067006900430065007200740000001d000000010000001000000059779e39e21a2e3dfced6857ed5c5fd9030000000100000014000000a8985d3a65e5e5c4b2d7d66d40c6dd2fb19c54361900000001000000100000000f3a0527d242de2dc98e5cfcb1e991ee2000000001000000b3030000308203af30820297a0030201020210083be056904246b1a1756ac95991c74a300d06092a864886f70d01010505003061310b300906035504061302555331153013060355040a130c446967694365727420496e6331193017060355040b13107777772e64696769636572742e636f6d3120301e06035504031317446967694365727420476c6f62616c20526f6f74204341301e170d3036313131303030303030305a170d3331313131303030303030305a3061310b300906035504061302555331153013060355040a130c446967694365727420496e6331193017060355040b13107777772e64696769636572742e636f6d3120301e06035504031317446967694365727420476c6f62616c20526f6f7420434130820122300d06092a864886f70d01010105000382010f003082010a0282010100e23be11172dea8a4d3a357aa50a28f0b7790c9a2a5ee12ce965b010920cc0193a74e30b753f743c46900579de28d22dd870640008109cece1b83bfdfcd3b7146e2d666c705b37627168f7b9e1e957deeb748a308dad6af7a0c3906657f4a5d1fbc17f8abbeee28d7747f7a78995985686e5c23324bbf4ec0e85a6de370bf7710bffc01f685d9a844105832a97518d5d1a2be47e2276af49a33f84908608bd45fb43a84bfa1aa4a4c7d3ecf4f5f6c765ea04b37919edc22e66dce141a8e6acbfecdb3146417c75b299e32bff2eefad30b42d4abb74132da0cd4eff881d5bb8d583fb51be84928a270da3104ddf7b216f24c0a4e07a8ed4a3d5eb57fa390c3af270203010001a3633061300e0603551d0f0101ff040403020186300f0603551d130101ff040530030101ff301d0603551d0e0416041403de503556d14cbb66f0a3e21b1bc397b23dd155301f0603551d2304183016801403de503556d14cbb66f0a3e21b1bc397b23dd155300d06092a864886f70d01010505000382010100cb9c37aa4813120afadd449c4f52b0f4dfae04f5797908a32418fc4b2b84c02db9d5c7fef4c11f58cbb86d9c7a74e79829ab11b5e370a0a1cd4c8899938c9170e2ab0f1cbe93a9ff63d5e40760d3a3bf9d5b09f1d58ee353f48e63fa3fa7dbb466df6266d6d16e418df22db5ea774a9f9d58e22b59c04023ed2d2882453e7954922698e08048a837eff0d6796016deace80ecd6eac4417382f49dae1453e2ab93653cf3a5006f72ee8c457496c612118d504ad783c2c3a806ba7ebaf1514e9d889c1b9386ce2916c8aff64b977255730c01b24a3e1dce9df477cb5b424080530ec2dbd0bbf45bf50b9a9f3eb980112adc888c698345f8d0a3cc6e9d595956dde	updater.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\A8985D3A65E5E5C4B2D7D66D40C6DD2FB19C5436	updater.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
556	updater.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	880	csrts.exe
Token: SeDebugPrivilege	556	updater.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 880 wrote to memory of 556	880	csrts.exe	27
PID 880 wrote to memory of 556	880	csrts.exe	27
PID 880 wrote to memory of 556	880	csrts.exe	27
PID 880 wrote to memory of 556	880	csrts.exe	27
PID 880 wrote to memory of 556	880	csrts.exe	27
PID 880 wrote to memory of 556	880	csrts.exe	27
PID 880 wrote to memory of 556	880	csrts.exe	27
PID 880 wrote to memory of 1184	880	csrts.exe	28
PID 880 wrote to memory of 1184	880	csrts.exe	28
PID 880 wrote to memory of 1184	880	csrts.exe	28
PID 880 wrote to memory of 1184	880	csrts.exe	28
PID 556 wrote to memory of 544	556	updater.exe	31
PID 556 wrote to memory of 544	556	updater.exe	31
PID 556 wrote to memory of 544	556	updater.exe	31
PID 556 wrote to memory of 544	556	updater.exe	31

C:\Users\Admin\AppData\Local\Temp\csrts.exe
"C:\Users\Admin\AppData\Local\Temp\csrts.exe"
1⤵
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:880
- C:\Users\Admin\AppData\Roaming\updater.exe
  "C:\Users\Admin\AppData\Roaming\updater.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Modifies system certificate store
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:556
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\6d5d13e1-cd55-4f10-ac91-93f6389261df.bat" "
    3⤵
    PID:544
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\30e6376c-b318-4bb5-a22d-d653d59640c1.bat" "
  2⤵
  - Deletes itself
  PID:1184

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Install Root Certificate

Modify Registry

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/556-68-0x0000000000390000-0x000000000039E000-memory.dmp

Filesize
56KB

Download
memory/556-63-0x0000000000300000-0x000000000037E000-memory.dmp

Filesize
504KB

Download
memory/556-70-0x0000000004BB0000-0x0000000004BB1000-memory.dmp

Filesize
4KB

Download
memory/556-69-0x0000000074A3E000-0x0000000074A3F000-memory.dmp

Filesize
4KB

Download
memory/556-72-0x00000000005D0000-0x0000000000600000-memory.dmp

Filesize
192KB

Download
memory/556-73-0x0000000004BB5000-0x0000000004BC6000-memory.dmp

Filesize
68KB

Download
memory/880-55-0x0000000074A3E000-0x0000000074A3F000-memory.dmp

Filesize
4KB

Download
memory/880-59-0x0000000004A75000-0x0000000004A86000-memory.dmp

Filesize
68KB

Download
memory/880-58-0x0000000000560000-0x000000000056E000-memory.dmp

Filesize
56KB

Download
memory/880-57-0x0000000004A70000-0x0000000004A71000-memory.dmp

Filesize
4KB

Download
memory/880-56-0x00000000013E0000-0x000000000145E000-memory.dmp

Filesize
504KB

Download

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