c605f05f3b3c4bbfef633280d32e2acd7d61224949a117b377da15e6c9f16728

Analysis

max time kernel
141s
max time network
123s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
25/12/2023, 12:17

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General

Target

tightvnc-1.3.8-setup.exe
Size

1.0MB
MD5

62f26819d69ee139b04c50cd8f22540b
SHA1

906d589e49077daad93b094ff69e4eb36d3e27ba
SHA256

c09286e5e4cd4eab4e3fd3577970bb99e8dfe2429102753d2bb38951151b3096
SHA512

60b277818704822facd86fd6b5490659a54f12cccb39231d42d31ba3aa4b575be308a2ac03b34c4df5487d428af6c9f05d905f6ef6c18fcb7cf412608ce7d82a
SSDEEP

24576:fMurJx5mbl0vlSMY5TFFOVY8RGxAqxI9w+Hs:0urJx5m50aLIqS3NHs

Score

7^/10

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
2464	is-JE71A.tmp

Loads dropped DLL 4 IoCs

pid	Process
2184	tightvnc-1.3.8-setup.exe
2464	is-JE71A.tmp
2464	is-JE71A.tmp
2464	is-JE71A.tmp

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

System Information Discovery
T1082

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2464	is-JE71A.tmp

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2184 wrote to memory of 2464	2184	tightvnc-1.3.8-setup.exe	28
PID 2184 wrote to memory of 2464	2184	tightvnc-1.3.8-setup.exe	28
PID 2184 wrote to memory of 2464	2184	tightvnc-1.3.8-setup.exe	28
PID 2184 wrote to memory of 2464	2184	tightvnc-1.3.8-setup.exe	28
PID 2184 wrote to memory of 2464	2184	tightvnc-1.3.8-setup.exe	28
PID 2184 wrote to memory of 2464	2184	tightvnc-1.3.8-setup.exe	28
PID 2184 wrote to memory of 2464	2184	tightvnc-1.3.8-setup.exe	28

C:\Users\Admin\AppData\Local\Temp\tightvnc-1.3.8-setup.exe
"C:\Users\Admin\AppData\Local\Temp\tightvnc-1.3.8-setup.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2184
- C:\Users\Admin\AppData\Local\Temp\is-202A1.tmp\is-JE71A.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-202A1.tmp\is-JE71A.tmp" /SL4 $70122 C:\Users\Admin\AppData\Local\Temp\tightvnc-1.3.8-setup.exe 852240 50688
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious behavior: GetForegroundWindowSpam
  PID:2464

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\is-202A1.tmp\is-JE71A.tmp

Filesize
572KB

MD5
0d0622f7d2fd629455a028d7e1cb1c07

SHA1
82bdfc15f188241c535d7a42f0f95c99d0913bf4

SHA256
ab0982c120a65adc3aa898af09ad923c9b896edfc52f7d206798c5fdf59d8f5a

SHA512
eb5a930c1ba85b9cdb60a65fcead39592f7a1b87985d927580bbdb9f8682087291a4eac9f5b2f7c8d4aa7abff78ce8c53dd7285bd7be8572cb65ade906e8807a

Download Submit
\Users\Admin\AppData\Local\Temp\is-EMUL7.tmp\_isdecmp.dll

Filesize
12KB

MD5
9f015911c4073ba9b8ad5a4c36fcaf88

SHA1
d4bd8d2348a2a6294f3f92ad7831f2cf660da6a5

SHA256
c630fb87c007c1e3d008eac97edf7e025c0cb806c886971e32b7063d606fd125

SHA512
c36dc582141259ec0813edf531431870f96acc346e3f9af0cd86544245a84bb2d6bc4c37518bf309fa0922cdd5535d087e4fef20f0d5aa0494b1a4b0ce388ea9

Download Submit
\Users\Admin\AppData\Local\Temp\is-EMUL7.tmp\_shfoldr.dll

Filesize
22KB

MD5
92dc6ef532fbb4a5c3201469a5b5eb63

SHA1
3e89ff837147c16b4e41c30d6c796374e0b8e62c

SHA256
9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87

SHA512
9908e573921d5dbc3454a1c0a6c969ab8a81cc2e8b5385391d46b1a738fb06a76aa3282e0e58d0d2ffa6f27c85668cd5178e1500b8a39b1bbae04366ae6a86d3

Download Submit
memory/2184-0-0x0000000000400000-0x0000000000413000-memory.dmp

Filesize
76KB

Download
memory/2184-16-0x0000000000400000-0x0000000000413000-memory.dmp

Filesize
76KB

Download
memory/2464-17-0x0000000000400000-0x000000000049D000-memory.dmp

Filesize
628KB

Download