gurcu | fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

Analysis

max time kernel
122s
max time network
159s
platform
windows10-2004_x64
resource
win10v2004-20230703-en
resource tags

arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
submitted
23-08-2023 14:59

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General

Target

build_4.exe
Size

165KB
MD5

547933c1a8ea0eb111e619d70ca2c657
SHA1

aca394a095c3951ace115ac621a67df1ff4d2e33
SHA256

fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea
SHA512

5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b
SSDEEP

1536:ROwwIJbzij3pPEOGFmd8Szav8IDYFUxT1DR5jPVSBSVG41AG9wL4yXacCwPIC6Xi:RyIlz2p8Yai3GNzDeeb4FzeDGwKSHqj

Score

10^/10

gurcu spyware stealer

Malware Config

Extracted

Family

gurcu

https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643

Signatures

Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
stealer gurcu

Executes dropped EXE 6 IoCs

pid	Process
764	build_4.exe
232	tor.exe
4864	build_4.exe
4344	tor.exe
260	build_4.exe
4116	tor.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

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
3	ip-api.com

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

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
2332	4864	WerFault.exe	92
2952	260	WerFault.exe	105

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
3468	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1156	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
764	build_4.exe
4864	build_4.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	764	build_4.exe
Token: SeDebugPrivilege	4864	build_4.exe
Token: SeDebugPrivilege	260	build_4.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 4568 wrote to memory of 3124	4568	build_4.exe	80
PID 4568 wrote to memory of 3124	4568	build_4.exe	80
PID 3124 wrote to memory of 2152	3124	cmd.exe	82
PID 3124 wrote to memory of 2152	3124	cmd.exe	82
PID 3124 wrote to memory of 1156	3124	cmd.exe	83
PID 3124 wrote to memory of 1156	3124	cmd.exe	83
PID 3124 wrote to memory of 3468	3124	cmd.exe	84
PID 3124 wrote to memory of 3468	3124	cmd.exe	84
PID 3124 wrote to memory of 764	3124	cmd.exe	85
PID 3124 wrote to memory of 764	3124	cmd.exe	85
PID 764 wrote to memory of 4284	764	build_4.exe	86
PID 764 wrote to memory of 4284	764	build_4.exe	86
PID 764 wrote to memory of 232	764	build_4.exe	88
PID 764 wrote to memory of 232	764	build_4.exe	88
PID 4864 wrote to memory of 4344	4864	build_4.exe	93
PID 4864 wrote to memory of 4344	4864	build_4.exe	93
PID 260 wrote to memory of 4116	260	build_4.exe	106
PID 260 wrote to memory of 4116	260	build_4.exe	106

C:\Users\Admin\AppData\Local\Temp\build_4.exe
"C:\Users\Admin\AppData\Local\Temp\build_4.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4568
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "build_4" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\build_4.exe" &&START "" "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3124
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2152
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:1156
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "build_4" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:3468
- - C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
    "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:764
  - - C:\Windows\System32\tar.exe
      "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp556E.tmp" -C "C:\Users\Admin\AppData\Local\d92pmiifqt"
      4⤵
      PID:4284
  - - C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe
      "C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d92pmiifqt\torrc.txt"
      4⤵
      Executes dropped EXE
      PID:232

C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
1⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4864
- C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe
  "C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d92pmiifqt\torrc.txt"
  2⤵
  - Executes dropped EXE
  PID:4344
- C:\Windows\system32\WerFault.exe
  C:\Windows\system32\WerFault.exe -u -p 4864 -s 2120
  2⤵
  - Program crash
  PID:2332

C:\Windows\system32\WerFault.exe
C:\Windows\system32\WerFault.exe -pss -s 404 -p 4864 -ip 4864
1⤵
PID:4884

C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:260
- C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe
  "C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d92pmiifqt\torrc.txt"
  2⤵
  - Executes dropped EXE
  PID:4116
- C:\Windows\system32\WerFault.exe
  C:\Windows\system32\WerFault.exe -u -p 260 -s 1652
  2⤵
  - Program crash
  PID:2952

C:\Windows\system32\WerFault.exe
C:\Windows\system32\WerFault.exe -pss -s 480 -p 260 -ip 260
1⤵
PID:3352

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\build_4.exe.log

Filesize
847B

MD5
3308a84a40841fab7dfec198b3c31af7

SHA1
4e7ab6336c0538be5dd7da529c0265b3b6523083

SHA256
169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

SHA512
97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

Download Submit
C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

Filesize
165KB

MD5
547933c1a8ea0eb111e619d70ca2c657

SHA1
aca394a095c3951ace115ac621a67df1ff4d2e33

SHA256
fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

SHA512
5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

Download Submit
C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

Filesize
165KB

MD5
547933c1a8ea0eb111e619d70ca2c657

SHA1
aca394a095c3951ace115ac621a67df1ff4d2e33

SHA256
fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

SHA512
5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

Download Submit
C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

Filesize
165KB

MD5
547933c1a8ea0eb111e619d70ca2c657

SHA1
aca394a095c3951ace115ac621a67df1ff4d2e33

SHA256
fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

SHA512
5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

Download Submit
C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

Filesize
165KB

MD5
547933c1a8ea0eb111e619d70ca2c657

SHA1
aca394a095c3951ace115ac621a67df1ff4d2e33

SHA256
fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

SHA512
5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp556E.tmp

Filesize
13.3MB

MD5
89d2d5811c1aff539bb355f15f3ddad0

SHA1
5bb3577c25b6d323d927200c48cd184a3e27c873

SHA256
b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

SHA512
39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\data\cached-microdesc-consensus.tmp

Filesize
2.5MB

MD5
8b729d2f0958337cf9c78b1d904fe24f

SHA1
542982f4376104c1b0e943eea9a293df3ea3e756

SHA256
6b47307d184ff963a8b4e152a29f13fe6642e0f31115f97c23837f8cd0820279

SHA512
127593501f6146406bd2db99293289c1d2d3012c0410428fb8f4c4bfdb4c92d38b83b237c7dc470be8bf8af0a2faccc73a3d16966b4c21612f57dd6597452bde

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\data\cached-microdescs.new

Filesize
7.5MB

MD5
c121a8341f6a68a6c62a40550faac228

SHA1
e80fec8deef746a01fe5c6be387935508cf42320

SHA256
bb6bb2bc50b65fb0e13a3bacaf8f91f251fe4c4a1d36f89e91a7a903a05697fc

SHA512
3cd68aaec5c4e0ed206127991bb790ef13c61f6c1a3853905162b7f1c7e2e11c662475a09465f6a9a3509df3776c2237f1b4f5ba0b9b1da12a44683706c8a0e3

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\host\hostname

Filesize
64B

MD5
0a5c60bdd40d503b76e28d76d088b764

SHA1
844d0ce6d3c0c3bb4144c2c11e9d0ecfa9965199

SHA256
7a5c2861118ca0198f0bf97bd24072ed7baf89ad6992d75466137607885f7d7f

SHA512
95159b8c2b96aa558c0c659c8ba7bf78c9ca2ded0e7e423c6743160e0088f6fb087defbdd94307208c0e0a7d9ddd347cbda1e768fdde28ddb747afb2770962bd

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\port.dat

Filesize
4B

MD5
e9412ee564384b987d086df32d4ce6b7

SHA1
e284346433398bedfc922cb01c47ce07200715c4

SHA256
4fbb9cf6972a100cd12fee93b2eb185f4cf2964906979ea2a2ac4e5c1759254f

SHA512
db39efb0b4f49811b49257bab8585b8e92a1081e255c68c8249ec982e40ac98274548bf6f133336d8e11baaf5e9456d16de7d627cc121a2f208901d3ba03fdea

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\torrc.txt

Filesize
218B

MD5
74f8f09d738f8f49fd39af48ac76772c

SHA1
388512b8cbadd68e5fbb35d468aed7d94db302a1

SHA256
00c504d22bc870835cfcbd8bba818467a6cba5297e4024704deaad3be61acbd5

SHA512
68a8e6d3d3375f2869ac9276fcecb92a026b1ad39de7994b5c5cea8f851da50832f2ee433043997ddd4cd0894cc90251751915ab7b611b25ccf13fd885598bf6

Download Submit
memory/260-91-0x00007FFC8D1F0000-0x00007FFC8DCB1000-memory.dmp

Filesize
10.8MB

Download
memory/260-89-0x000001A3393D0000-0x000001A3393E0000-memory.dmp

Filesize
64KB

Download
memory/260-88-0x00007FFC8D1F0000-0x00007FFC8DCB1000-memory.dmp

Filesize
10.8MB

Download
memory/764-28-0x0000024098A00000-0x0000024098A10000-memory.dmp

Filesize
64KB

Download
memory/764-17-0x00007FFC8D1F0000-0x00007FFC8DCB1000-memory.dmp

Filesize
10.8MB

Download
memory/764-12-0x0000024098A00000-0x0000024098A10000-memory.dmp

Filesize
64KB

Download
memory/764-11-0x00007FFC8D1F0000-0x00007FFC8DCB1000-memory.dmp

Filesize
10.8MB

Download
memory/4568-2-0x000002C5A4560000-0x000002C5A4570000-memory.dmp

Filesize
64KB

Download
memory/4568-0-0x000002C5A4180000-0x000002C5A41B0000-memory.dmp

Filesize
192KB

Download
memory/4568-6-0x00007FFC8D1F0000-0x00007FFC8DCB1000-memory.dmp

Filesize
10.8MB

Download
memory/4568-1-0x00007FFC8D1F0000-0x00007FFC8DCB1000-memory.dmp

Filesize
10.8MB

Download
memory/4864-75-0x00007FFC8D1F0000-0x00007FFC8DCB1000-memory.dmp

Filesize
10.8MB

Download
memory/4864-85-0x00007FFC8D1F0000-0x00007FFC8DCB1000-memory.dmp

Filesize
10.8MB

Download
memory/4864-80-0x000001C3E6EF0000-0x000001C3E6F00000-memory.dmp

Filesize
64KB

Download
memory/4864-79-0x00007FFC8D1F0000-0x00007FFC8DCB1000-memory.dmp

Filesize
10.8MB

Download
memory/4864-76-0x000001C3E6EF0000-0x000001C3E6F00000-memory.dmp

Filesize
64KB

Download