cb56bffb224d9bcff0753d58995c25f6f944bcb075560019cd87283e3b443aa3

General

Target

csrss.exe
Size

638KB
MD5

12c26ab43202d2ef17553eeb17376c2a
SHA1

0b6226071ab1711bbbfaca2cdad6783d2658d797
SHA256

cb56bffb224d9bcff0753d58995c25f6f944bcb075560019cd87283e3b443aa3
SHA512

215e497f9ead486e618b940109553a703042cc0dcd7802cd7c36aac296ddfe27a5ce693891ed50e64dd68a03ba029928ab2c302a38de04e02e5ce3b3c0661f79
SSDEEP

12288:RQi9zSYMvrOK9BOKjHol+yFnWVOjTPlxsU807BN/9+FJeyuAJMX7QYQ:RQiE7eORaEOjRxsUrLUoJi

Score

7^/10

discovery

Malware Config

Signatures

Executes dropped EXE 2 IoCs

pid	Process
1816	csrss.tmp
4992	DuckDns.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

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	checkip.amazonaws.com

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\DuckDNS\DuckDns.exe	csrss.tmp
File created	C:\Program Files (x86)\DuckDNS\unins000.dat	csrss.tmp
File created	C:\Program Files (x86)\DuckDNS\is-VESMM.tmp	csrss.tmp
File created	C:\Program Files (x86)\DuckDNS\is-FLIEE.tmp	csrss.tmp
File opened for modification	C:\Program Files (x86)\DuckDNS\unins000.dat	csrss.tmp

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1816	csrss.tmp
1816	csrss.tmp

Suspicious use of FindShellTrayWindow 5 IoCs

pid	Process
1816	csrss.tmp
2252	javaw.exe
2252	javaw.exe
2252	javaw.exe
2252	javaw.exe

Suspicious use of SendNotifyMessage 4 IoCs

pid	Process
2252	javaw.exe
2252	javaw.exe
2252	javaw.exe
2252	javaw.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
2252	javaw.exe
2252	javaw.exe
2252	javaw.exe
2252	javaw.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3940 wrote to memory of 1816	3940	csrss.exe	83
PID 3940 wrote to memory of 1816	3940	csrss.exe	83
PID 3940 wrote to memory of 1816	3940	csrss.exe	83
PID 4992 wrote to memory of 2252	4992	DuckDns.exe	88
PID 4992 wrote to memory of 2252	4992	DuckDns.exe	88

C:\Users\Admin\AppData\Local\Temp\csrss.exe
"C:\Users\Admin\AppData\Local\Temp\csrss.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3940
- C:\Users\Admin\AppData\Local\Temp\is-DH737.tmp\csrss.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-DH737.tmp\csrss.tmp" /SL5="$D0046,402740,84480,C:\Users\Admin\AppData\Local\Temp\csrss.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Program Files directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of FindShellTrayWindow
  PID:1816

C:\Program Files (x86)\DuckDNS\DuckDns.exe
"C:\Program Files (x86)\DuckDNS\DuckDns.exe"
1⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:4992
- C:\Program Files\Java\jre-1.8\bin\javaw.exe
  "C:\Program Files\Java\jre-1.8\bin\javaw.exe" -jar "C:\Program Files (x86)\DuckDNS\DuckDns.exe"
  2⤵
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  PID:2252

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Program Files (x86)\DuckDNS\DuckDns.exe

Filesize
350KB

MD5
96e657f29c85d52e65c26325b4ebb41a

SHA1
0b843f1635cccf53942cb720e356e3b0cae5585b

SHA256
ff97fa590d1407bc09c24b4f14d8cd5c12fa89f9a87d5dfd8056ce9cd2b848e1

SHA512
aaacfce55064903f55d4dfa2bc571261b2e894332d8f672485cc24638c7539b934e10af2859d319b41230cae8db5134f7ef8b0b09d818bafb957c2ae85eb36fb

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-DH737.tmp\csrss.tmp

Filesize
719KB

MD5
8ff731d01f86d5ff9a326e82823cc30c

SHA1
9062aa438887b1f2e22e42b1adf56971b5a7e6e8

SHA256
3228932ba90230ec52dac304fb9f155ba2df33dd6775093fb7f3d0ae83546a28

SHA512
c4a67479069757dabfec6c8c97850f07a1ad9ca33287a06c0075289d2259e12958df36716074c61492b0a0a11924e40bf1825751974c117a151112f85d560ecc

Download Submit
C:\Users\Admin\AppData\Local\Temp\jar_cache972401588501601379.tmp

Filesize
285KB

MD5
afe75b4855c7aedea21c0101151599ca

SHA1
3ed782721068a6f6a4a537a20fdf7096686c4742

SHA256
ab3642f43d603d2c7156f14b99e2ea8c928d966fb69710a1871748e9b930df15

SHA512
4555d7efb291ba4d15dfc0b2365948fb9e3a983d0e1ce1589a2a0756e500b26ecf059cce8d7ece5677d1cd9dfe62d05f22169dd6c00cdd293398ced3d2e472fd

Download Submit
memory/1816-6-0x0000000000400000-0x00000000004C4000-memory.dmp

Filesize
784KB

Download
memory/1816-12-0x0000000000400000-0x00000000004C4000-memory.dmp

Filesize
784KB

Download
memory/1816-34-0x0000000000400000-0x00000000004C4000-memory.dmp

Filesize
784KB

Download
memory/2252-41-0x0000024B6DDB0000-0x0000024B6E020000-memory.dmp

Filesize
2.4MB

Download
memory/2252-77-0x0000024B6C730000-0x0000024B6C731000-memory.dmp

Filesize
4KB

Download
memory/2252-93-0x0000024B6C730000-0x0000024B6C731000-memory.dmp

Filesize
4KB

Download
memory/2252-108-0x0000024B6C730000-0x0000024B6C731000-memory.dmp

Filesize
4KB

Download
memory/3940-11-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/3940-0-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/3940-35-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/3940-3-0x0000000000401000-0x000000000040B000-memory.dmp

Filesize
40KB

Download
memory/4992-38-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

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Analysis

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