a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0

General

Target
jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe
Size 167KB
Sample261002-jrr14ach98
SHA256 a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0
MD5 6cc0ae03faeed41afe992bf023caa5f8
SHA1 52ab1ff3b5d12590ec6d0bc1580d27e38e21629c
SHA512 8ed986b9a3b94a1cbe1e8d58bea80a4f8700840db7a55dfe79d51e39bcd42fc23a670c0722d05edb391aecb4a61ee2d0b55ca29f6c964db171e435023ed34766
SSDEEP 3072:YrnP3w/xLZ4PhYCactkNmh6JwRO1E3l1ib2/ku:YrP3hhFasEO6yL342Mu
TLSH
T107F34B29A71AA3BBE26D86F9210E3F7A1CD461B5810F5C1FE3835544147EFE9A329703
MD5 SHA1 SHA512 SSDEEP TLSH

Score

7^/10

Malware Config

Signatures

Loads dropped DLL 2 IoCs

pid	Process
5004	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe
3708	rundll32.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\cwjlcy.dll = "C:\\Windows\\system32\\rundll32.exe C:\\Windows\\system32\\cwjlcy.dll,jksinwd"	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe

Installs/modifies Browser Helper Object 2 TTPs 1 IoCs

BHOs are DLL modules which act as plugins for Internet Explorer.

stealer adware

Modify Registry

T1112

Browser Extensions

T1176

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{13141EAA-5B67-EB40-5FBA-02CD37DE687B}	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\cwjlcy.dll	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe
File created	C:\Windows\SysWOW64\icfcjg.dll	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 1 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe

System Location Discovery: System Language Discovery 1 TTPs 2 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Modifies registry class 6 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{13141EAA-5B67-EB40-5FBA-02CD37DE687B}\InprocServer32	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{13141EAA-5B67-EB40-5FBA-02CD37DE687B}	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{13141EAA-5B67-EB40-5FBA-02CD37DE687B}\InprocServer32\ = "C:\\Windows\\SysWow64\\icfcjg.dll"	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{13141EAA-5B67-EB40-5FBA-02CD37DE687B}\InprocServer32\ThreadingModel = "Apartment"	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
5004	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe
5004	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 5004 wrote to memory of 3708	5004	jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe	89

C:\Users\Admin\AppData\Local\Temp\jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe
"C:\Users\Admin\AppData\Local\Temp\jaffacakes118_a3dbb8e963e88d4295c7def4b4cef1473d1527520ab7ac22feaa5340b407f1d0.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Installs/modifies Browser Helper Object
- Drops file in System32 directory
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:5004
- C:\Windows\SysWOW64\rundll32.exe
  C:\Windows\system32\rundll32.exe C:\Windows\system32\cwjlcy.dll,jksinwd
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  PID:3708

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Browser Extensions

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

cwjlcy.dll

Path C:\Windows\SysWOW64\cwjlcy.dll
Size 57KB
SHA256 8474cb010818e231a534ecdecd317f085cfedecc3bc05c6a41f346aca0dc8975
MD5 4dca169630b4a35f0c145084b2967afd
SHA1 b837231717efc9936c31e34b20ddf2c7458f6cb1
SHA512 34afa4dd7b13c9132dedae98d05dce498397a80ad80e8765754d3e185b73eeae303c7153d2edf3555e35f6e9a1553232c3ca1b28a5e4e603cf8a8dc6c7a55a6c
SSDEEP 1536:ItxvzUEfe/hi6JQrzk1nupSohcbTJwRR8j:MhYCactkNmh6JwRO
TLSH
T1BA431929A31E23BFE3AA86BC010E7A7F1CE46438911F591FE3931984553EFC5A259743
MD5 SHA1 SHA512 SSDEEP TLSH

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icfcjg.dll

Path C:\Windows\SysWOW64\icfcjg.dll
Size 70KB
SHA256 71481ea7844c589b33bc96933f3c1d1b275ccb219fdd26cd56576a4f722b17d9
MD5 467a546dd54aa53d494a834f9da58a33
SHA1 2367be7cb4140dfe4c112bd6fbfa24a0d2f84472
SHA512 f7199122bf94865367cfb79a252dda3079de1c7846c338dfc7b369f540f527915c6e9f37942ce0c94a5b0b30d86392d499c6c941651b3bf13cb7d466ec386335
SSDEEP 1536:5AfX3cdZ5Cn+avAzW/1qtf/fy1izP4nj/kuU:PE3l1ib2/ku
TLSH
T10E63F62A672AE3F6E2A996FA315E3FB518C551F6811F5C0F93839444107ABFC6729303
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/3708-9-0x0000000010000000-0x0000000010016000-memory.dmp

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memory/3708-11-0x0000000010000000-0x0000000010016000-memory.dmp

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memory/5004-0-0x0000000000400000-0x000000000042C000-memory.dmp

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memory/5004-6-0x0000000010000000-0x0000000010018000-memory.dmp

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memory/5004-12-0x0000000000400000-0x000000000042C000-memory.dmp

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memory/5004-14-0x0000000010000000-0x0000000010018000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads