6a195e6111c9a4b8c874d51937b53cd5b4b78efc32f7bb255012d05087586d8f

General

Target

RtlUpd.dll
Size

62KB
MD5

c16bdc61bbc82e9668f8cee9cc5c94c5
SHA1

c2f98475c7be3064e0b294ef546f57d3c3a1e267
SHA256

6a195e6111c9a4b8c874d51937b53cd5b4b78efc32f7bb255012d05087586d8f
SHA512

9337275916970bd88fb1de18959bf587e29147cf6198e3a242679b198cca26d7ddeeda2e893145058444e494048768ac33ce36e75a44fb84b4a0c50a3814faae
SSDEEP

1536:yyMGpJvykUU0mVWUBmJyB1NjKOaSHGfuUF8u7J8NG3:nrpPUUXWXK1NoLfuQ8u7J8Nw

Score

8^/10

discovery

Malware Config

Signatures

Blocklisted process makes network request 20 IoCs

flow	pid	Process
4	2560	rundll32.exe
5	2560	rundll32.exe
6	2560	rundll32.exe
7	2560	rundll32.exe
8	2560	rundll32.exe
9	2560	rundll32.exe
10	2560	rundll32.exe
11	2560	rundll32.exe
12	2560	rundll32.exe
13	2560	rundll32.exe
14	2560	rundll32.exe
15	2560	rundll32.exe
16	2560	rundll32.exe
17	2560	rundll32.exe
18	2560	rundll32.exe
19	2560	rundll32.exe
20	2560	rundll32.exe
21	2560	rundll32.exe
22	2560	rundll32.exe
23	2560	rundll32.exe

Loads dropped DLL 4 IoCs

pid	Process
2560	rundll32.exe
2560	rundll32.exe
2560	rundll32.exe
2560	rundll32.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\Windows\Temporary Internet Files\counters.dat	rundll32.exe
File created	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\0OP4TBWO.htm	rundll32.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\Tasks\RtlUpd.job	regsvr32.exe

Checks processor information in registry 2 TTPs 5 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

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

Modifies data under HKEY_USERS 21 IoCs

description	ioc	Process
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 4600000002000000090000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyEnable = "0"	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\f6-76-1f-50-6a-45\WpadDecisionTime = 0007c6a5159bda01	rundll32.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Cookies\CachePrefix = "Cookie:"	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings = 4600000003000000090000000000000000000000000000000400000000000000000000000000000000000000000000000000000001000000020000000a7f007c000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{BB1A12E7-0B09-4D53-93DB-81673BE5B39A}\WpadDecisionTime = 0007c6a5159bda01	rundll32.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Content\CachePrefix	rundll32.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\History\CachePrefix = "Visited:"	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{BB1A12E7-0B09-4D53-93DB-81673BE5B39A}\WpadDecisionReason = "1"	rundll32.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{BB1A12E7-0B09-4D53-93DB-81673BE5B39A}\WpadNetworkName = "Network 3"	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\f6-76-1f-50-6a-45	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{BB1A12E7-0B09-4D53-93DB-81673BE5B39A}\f6-76-1f-50-6a-45	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\f6-76-1f-50-6a-45\WpadDecisionReason = "1"	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings	rundll32.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\SavedLegacySettings = 4600000002000000090000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	rundll32.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{BB1A12E7-0B09-4D53-93DB-81673BE5B39A}	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\{BB1A12E7-0B09-4D53-93DB-81673BE5B39A}\WpadDecision = "0"	rundll32.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\f6-76-1f-50-6a-45\WpadDecision = "0"	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2736 wrote to memory of 2560	2736	taskeng.exe	31
PID 2736 wrote to memory of 2560	2736	taskeng.exe	31
PID 2736 wrote to memory of 2560	2736	taskeng.exe	31

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\RtlUpd.dll
1⤵
- Drops file in Windows directory
PID:1728

C:\Windows\system32\taskeng.exe
taskeng.exe {3019CD11-85CD-4B51-9D84-EF8F03D879EE} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:2736
- C:\Windows\system32\rundll32.exe
  C:\Windows\system32\rundll32.exe "C:\ProgramData\RtlUpd\RtlUpd.dll",Start /p
  2⤵
  - Blocklisted process makes network request
  - Loads dropped DLL
  - Drops file in System32 directory
  - Checks processor information in registry
  - Modifies data under HKEY_USERS
  PID:2560

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\ProgramData\RtlUpd\RtlUpd.dll

Filesize
62KB

MD5
c16bdc61bbc82e9668f8cee9cc5c94c5

SHA1
c2f98475c7be3064e0b294ef546f57d3c3a1e267

SHA256
6a195e6111c9a4b8c874d51937b53cd5b4b78efc32f7bb255012d05087586d8f

SHA512
9337275916970bd88fb1de18959bf587e29147cf6198e3a242679b198cca26d7ddeeda2e893145058444e494048768ac33ce36e75a44fb84b4a0c50a3814faae

Download Submit
memory/1728-0-0x000007FEFB4E0000-0x000007FEFB4F8000-memory.dmp

Filesize
96KB

Download
memory/2560-10-0x000007FEFAA10000-0x000007FEFAA28000-memory.dmp

Filesize
96KB

Download

Resubmissions

Analysis

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