cb56bffb224d9bcff0753d58995c25f6f944bcb075560019cd87283e3b443aa3

Analysis

max time kernel
121s
max time network
122s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
16-07-2024 15:09

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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 1 IoCs

pid	Process
2520	csrss.tmp

Loads dropped DLL 4 IoCs

pid	Process
2104	csrss.exe
2520	csrss.tmp
2520	csrss.tmp
2520	csrss.tmp

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 Program Files directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\DuckDNS\unins000.dat	csrss.tmp
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-6058R.tmp	csrss.tmp
File created	C:\Program Files (x86)\DuckDNS\is-49BES.tmp	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
2520	csrss.tmp
2520	csrss.tmp

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2520	csrss.tmp

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2104 wrote to memory of 2520	2104	csrss.exe	30
PID 2104 wrote to memory of 2520	2104	csrss.exe	30
PID 2104 wrote to memory of 2520	2104	csrss.exe	30
PID 2104 wrote to memory of 2520	2104	csrss.exe	30
PID 2104 wrote to memory of 2520	2104	csrss.exe	30
PID 2104 wrote to memory of 2520	2104	csrss.exe	30
PID 2104 wrote to memory of 2520	2104	csrss.exe	30

C:\Users\Admin\AppData\Local\Temp\csrss.exe
"C:\Users\Admin\AppData\Local\Temp\csrss.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2104
- C:\Users\Admin\AppData\Local\Temp\is-FASP1.tmp\csrss.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-FASP1.tmp\csrss.tmp" /SL5="$400F4,402740,84480,C:\Users\Admin\AppData\Local\Temp\csrss.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of FindShellTrayWindow
  PID:2520

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

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-FASP1.tmp\csrss.tmp

Filesize
719KB

MD5
8ff731d01f86d5ff9a326e82823cc30c

SHA1
9062aa438887b1f2e22e42b1adf56971b5a7e6e8

SHA256
3228932ba90230ec52dac304fb9f155ba2df33dd6775093fb7f3d0ae83546a28

SHA512
c4a67479069757dabfec6c8c97850f07a1ad9ca33287a06c0075289d2259e12958df36716074c61492b0a0a11924e40bf1825751974c117a151112f85d560ecc

Download Submit
\Program Files (x86)\DuckDNS\unins000.exe

Filesize
730KB

MD5
5ee2008ae3eb35dc855f147f3dda5f56

SHA1
73b264a7cfabfd64c6c00a6c017741a5259fb6f1

SHA256
50f4d4c5533bffd18d56b6b33dccc705ed6b9e955939d144c53368b964b8abaf

SHA512
c4d184ec7856cae5b3b16ecbf6563d6e1cfa9f012d0439b0040bc6f58cf3bf78be03f390f19c442ba5bcfa3097a96d8715370da2a17b3d39abf039d0632a57e3

Download Submit
\Users\Admin\AppData\Local\Temp\is-HS69M.tmp\_isetup\_shfoldr.dll

Filesize
22KB

MD5
92dc6ef532fbb4a5c3201469a5b5eb63

SHA1
3e89ff837147c16b4e41c30d6c796374e0b8e62c

SHA256
9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87

SHA512
9908e573921d5dbc3454a1c0a6c969ab8a81cc2e8b5385391d46b1a738fb06a76aa3282e0e58d0d2ffa6f27c85668cd5178e1500b8a39b1bbae04366ae6a86d3

Download Submit
memory/2104-0-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2104-3-0x0000000000401000-0x000000000040B000-memory.dmp

Filesize
40KB

Download
memory/2104-15-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2104-49-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2520-10-0x0000000000400000-0x00000000004C4000-memory.dmp

Filesize
784KB

Download
memory/2520-16-0x0000000000400000-0x00000000004C4000-memory.dmp

Filesize
784KB

Download
memory/2520-48-0x0000000000400000-0x00000000004C4000-memory.dmp

Filesize
784KB

Download