42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8

General

Target

42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exe
Size

82KB
MD5

fd86018f2d0446207cd8fad5ae9a17d2
SHA1

1121f3c3839e63599ebded15c8f2ee30bcd463f3
SHA256

42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8
SHA512

486ee47c6a91a661e342f0452e5bb1d22dfc792b9048bb215f5b8b60f6d70716b32a584dcb656e2bd19d41348e47ec140de8c9fa984c464be8c01689e0a3af68
SSDEEP

768:qGHV45EDE477AZbUJx0rZGE3jCELoiMMj6hZ3nE+EXVmkDbjRL8Khc15Z6J1S:qG14P477AxUYrZGoC09k0SkTRHhWqP

Score

8^/10

bootkit discovery persistence spyware stealer

Malware Config

Signatures

Blocklisted process makes network request 4 IoCs

Processes:

rundll32.exe

flow pid process

5 1368 rundll32.exe
6 1368 rundll32.exe
7 1368 rundll32.exe
8 1368 rundll32.exe
Deletes itself 1 IoCs

Processes:

tcrum.exe

pid process

3064 tcrum.exe
Executes dropped EXE 1 IoCs

Processes:

tcrum.exe

pid process

3064 tcrum.exe
Loads dropped DLL 4 IoCs

Processes:

rundll32.exe

pid process

1368 rundll32.exe
1368 rundll32.exe
1368 rundll32.exe
1368 rundll32.exe
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

flow	pid	process
5	1368	rundll32.exe
6	1368	rundll32.exe
7	1368	rundll32.exe
8	1368	rundll32.exe

pid	process
3064	tcrum.exe

pid	process
3064	tcrum.exe

pid	process
1368	rundll32.exe
1368	rundll32.exe
1368	rundll32.exe
1368	rundll32.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

rundll32.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1846800975-3917212583-2893086201-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\gzwsnq\\lumrf.dll\",init"	rundll32.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

rundll32.exe

description	ioc	process
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
bootkit persistence

Bootkit
T1542.003

Processes:

rundll32.exe

description ioc process

File opened for modification \??\PHYSICALDRIVE0 rundll32.exe

description	ioc	process
File opened for modification	\??\PHYSICALDRIVE0	rundll32.exe

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

rundll32.exe42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.execmd.exePING.EXEtcrum.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tcrum.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs
Adversaries may check for Internet connectivity on compromised systems.
discovery

Internet Connection Discovery
T1016.001

Processes:

cmd.exePING.EXE

pid process

3020 cmd.exe
1224 PING.EXE

pid	process
3020	cmd.exe
1224	PING.EXE

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

rundll32.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

1224 PING.EXE
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

rundll32.exe

pid process

1368 rundll32.exe
1368 rundll32.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

rundll32.exe

description pid process

Token: SeDebugPrivilege 1368 rundll32.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exetcrum.exe

pid process

2948 42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exe
3064 tcrum.exe

pid	process
1224	PING.EXE

pid	process
1368	rundll32.exe
1368	rundll32.exe

description	pid	process
Token: SeDebugPrivilege	1368	rundll32.exe

pid	process
2948	42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exe
3064	tcrum.exe

Suspicious use of WriteProcessMemory 19 IoCs

Processes:

42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.execmd.exetcrum.exe

description	pid	process	target process
PID 2948 wrote to memory of 3020	2948	42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exe	cmd.exe
PID 2948 wrote to memory of 3020	2948	42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exe	cmd.exe
PID 2948 wrote to memory of 3020	2948	42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exe	cmd.exe
PID 2948 wrote to memory of 3020	2948	42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exe	cmd.exe
PID 3020 wrote to memory of 1224	3020	cmd.exe	PING.EXE
PID 3020 wrote to memory of 1224	3020	cmd.exe	PING.EXE
PID 3020 wrote to memory of 1224	3020	cmd.exe	PING.EXE
PID 3020 wrote to memory of 1224	3020	cmd.exe	PING.EXE
PID 3020 wrote to memory of 3064	3020	cmd.exe	tcrum.exe
PID 3020 wrote to memory of 3064	3020	cmd.exe	tcrum.exe
PID 3020 wrote to memory of 3064	3020	cmd.exe	tcrum.exe
PID 3020 wrote to memory of 3064	3020	cmd.exe	tcrum.exe
PID 3064 wrote to memory of 1368	3064	tcrum.exe	rundll32.exe
PID 3064 wrote to memory of 1368	3064	tcrum.exe	rundll32.exe
PID 3064 wrote to memory of 1368	3064	tcrum.exe	rundll32.exe
PID 3064 wrote to memory of 1368	3064	tcrum.exe	rundll32.exe
PID 3064 wrote to memory of 1368	3064	tcrum.exe	rundll32.exe
PID 3064 wrote to memory of 1368	3064	tcrum.exe	rundll32.exe
PID 3064 wrote to memory of 1368	3064	tcrum.exe	rundll32.exe

C:\Users\Admin\AppData\Local\Temp\42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exe
"C:\Users\Admin\AppData\Local\Temp\42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2948
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\tcrum.exe "C:\Users\Admin\AppData\Local\Temp\42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3020
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:1224
- - \??\c:\tcrum.exe
    c:\tcrum.exe "C:\Users\Admin\AppData\Local\Temp\42d88325fd376c59449c938b30dce65ea6c36e54f0954f2e5b06b63d07f90fa8.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3064
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\gzwsnq\lumrf.dll",init c:\tcrum.exe
      4⤵
      Blocklisted process makes network request
      Loads dropped DLL
      Adds Run key to start application
      Enumerates connected drives
      Writes to the Master Boot Record (MBR)
      System Location Discovery: System Language Discovery
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1368

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Peripheral Device Discovery

Query Registry

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

\??\c:\gzwsnq\lumrf.dll

Filesize
42KB

MD5
36e3fb5964d663272cf1169e1e1ca478

SHA1
58115e08b49505bcbbb5c88a28a86222ba18d5d4

SHA256
c7c41689de030df0f78f471422fa2a6383b36e77c94e7f6f124a96feb3e27ed7

SHA512
daff53b11aa400437a06287707a334a09661c1ef7d0fd8beaf1a874c79c16fe45bd1188343d0623e839d3ead5ea2dd90896e37ccf3b252c7220c74989a9ba442

Download Submit
\??\c:\tcrum.exe

Filesize
82KB

MD5
9b0bbdbf2de524cc995545b9b3958c21

SHA1
8c7f6cb8f6f8d0f14972f3690d4654f33582eb6a

SHA256
c3809fada4d0387d2bb3617c9706ff3ddd266aaf098c2f7534d8f70c1bc40984

SHA512
290d5bba7e9b4f6f6b0ffa1e6de89eccf6a2df756e71574c063a52fc90880a5199f0dbdbeebbdcdede6df8d29cabfb74d68d72364cc255ab63f8a82cdd198354

Download Submit
memory/1368-17-0x0000000010000000-0x000000001002E000-memory.dmp

Filesize
184KB

Download
memory/1368-15-0x0000000010000000-0x000000001002E000-memory.dmp

Filesize
184KB

Download
memory/1368-16-0x0000000010021000-0x0000000010022000-memory.dmp

Filesize
4KB

Download
memory/1368-18-0x0000000010000000-0x000000001002E000-memory.dmp

Filesize
184KB

Download
memory/1368-19-0x0000000010000000-0x000000001002E000-memory.dmp

Filesize
184KB

Download
memory/1368-20-0x0000000010021000-0x0000000010022000-memory.dmp

Filesize
4KB

Download
memory/2948-3-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2948-1-0x0000000000270000-0x0000000000271000-memory.dmp

Filesize
4KB

Download
memory/2948-0-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3020-6-0x0000000000320000-0x0000000000345000-memory.dmp

Filesize
148KB

Download
memory/3064-7-0x0000000000360000-0x0000000000361000-memory.dmp

Filesize
4KB

Download
memory/3064-9-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads