gurcu | a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

Analysis

max time kernel
128s
max time network
136s
platform
windows10-2004_x64
resource
win10v2004-20230831-en
resource tags

arch:x64arch:x86image:win10v2004-20230831-enlocale:en-usos:windows10-2004-x64system
submitted
08-09-2023 09:46

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General

Target

369204590CE91E77109E21A298753522.exe
Size

119KB
MD5

369204590ce91e77109e21a298753522
SHA1

e981f0c86c42e9e8fcbc7dcff0e05c35887a3869
SHA256

a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647
SHA512

bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32
SSDEEP

3072:P56Q4BB1q/hJcq4YZRKsySYSLLx9yLjj6TG6WVt9bm+EFyW43LORzMJS/3:Fha6BuQdwLKTGLt9bmhD4q1Mc

Score

10^/10

gurcu collection discovery spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 3 IoCs

resource	yara_rule
behavioral2/memory/2004-0-0x000002379E9B0000-0x000002379E9D4000-memory.dmp	family_gurcu_v3
behavioral2/files/0x0007000000023214-9.dat	family_gurcu_v3
behavioral2/files/0x0007000000023214-8.dat	family_gurcu_v3

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

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Control Panel\International\Geo\Nation	369204590CE91E77109E21A298753522.exe
Key value queried	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Control Panel\International\Geo\Nation	369204590CE91E77109E21A298753522.exe

Executes dropped EXE 2 IoCs

pid	Process
3452	369204590CE91E77109E21A298753522.exe
2156	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

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	369204590CE91E77109E21A298753522.exe
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	369204590CE91E77109E21A298753522.exe
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	369204590CE91E77109E21A298753522.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
37	ip-api.com

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

System Information Discovery
T1082

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
232	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
636	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3452	369204590CE91E77109E21A298753522.exe
3452	369204590CE91E77109E21A298753522.exe
3452	369204590CE91E77109E21A298753522.exe
3452	369204590CE91E77109E21A298753522.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2004	369204590CE91E77109E21A298753522.exe
Token: SeDebugPrivilege	3452	369204590CE91E77109E21A298753522.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3452	369204590CE91E77109E21A298753522.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 2004 wrote to memory of 1048	2004	369204590CE91E77109E21A298753522.exe	85
PID 2004 wrote to memory of 1048	2004	369204590CE91E77109E21A298753522.exe	85
PID 1048 wrote to memory of 3440	1048	cmd.exe	87
PID 1048 wrote to memory of 3440	1048	cmd.exe	87
PID 1048 wrote to memory of 636	1048	cmd.exe	88
PID 1048 wrote to memory of 636	1048	cmd.exe	88
PID 1048 wrote to memory of 232	1048	cmd.exe	93
PID 1048 wrote to memory of 232	1048	cmd.exe	93
PID 1048 wrote to memory of 3452	1048	cmd.exe	94
PID 1048 wrote to memory of 3452	1048	cmd.exe	94
PID 3452 wrote to memory of 1184	3452	369204590CE91E77109E21A298753522.exe	98
PID 3452 wrote to memory of 1184	3452	369204590CE91E77109E21A298753522.exe	98
PID 3452 wrote to memory of 2156	3452	369204590CE91E77109E21A298753522.exe	100
PID 3452 wrote to memory of 2156	3452	369204590CE91E77109E21A298753522.exe	100

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	369204590CE91E77109E21A298753522.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	369204590CE91E77109E21A298753522.exe

C:\Users\Admin\AppData\Local\Temp\369204590CE91E77109E21A298753522.exe
"C:\Users\Admin\AppData\Local\Temp\369204590CE91E77109E21A298753522.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2004
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "369204590CE91E77109E21A298753522" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\369204590CE91E77109E21A298753522.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1048
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:3440
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:636
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "369204590CE91E77109E21A298753522" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:232
- - C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe
    "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Accesses Microsoft Outlook profiles
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    - outlook_office_path
    - outlook_win_path
    PID:3452
  - - C:\Windows\System32\tar.exe
      "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmpB1FA.tmp" -C "C:\Users\Admin\AppData\Local\84tnjh4449"
      4⤵
      PID:1184
  - - C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe
      "C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\84tnjh4449\torrc.txt"
      4⤵
      Executes dropped EXE
      PID:2156

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

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\84tnjh4449\data\cached-certs

Filesize
18KB

MD5
8a61a80582aa209b5a2bee3b430692ac

SHA1
9ade239d05bc8d510aafcdeb57618eec0cc61495

SHA256
59fdb65c676d64e7b2343fb337e9216f2fa7674a16df831c4c327840f8380f8e

SHA512
1afed0a7609d33bf0f8873d179f71424e377d6cca21e081fe596c684c6ba6040024a78210b69f7751ac28b2efbb33c819c89969f3cb02218111c6d4b81bd437b

Download Submit
C:\Users\Admin\AppData\Local\84tnjh4449\data\cached-microdesc-consensus.tmp

Filesize
2.6MB

MD5
a16fb07bbf99c6183f970b4035eb661e

SHA1
8f62ae7875b0473da5b32feff18f468ce6912ef1

SHA256
f364c978e02cd9edc1e0c5728887a1b58c7382bb1a489a571eedcb09dd8c7b0a

SHA512
a81bea0d5ce95fced2089953d9b6e7d99ed5d46885549a5210ad12a6251d8ae4ae00072c246239cacb6cf10b238d71999cb98f3dbd301ab6b6184f737e0e3cbb

Download Submit
C:\Users\Admin\AppData\Local\84tnjh4449\data\cached-microdescs.new

Filesize
6.7MB

MD5
7c8525bb7aeaad9f3a38e9d3a13dc588

SHA1
0b0cfec359e8bc32726c28c61d25e860748b85bd

SHA256
3fac37e379ccab04255da34df1d9fd47676b6a99650cba1c14824c9ae0bde25b

SHA512
f0c6eb254948567462844f670bb180ade8715f101bd6ee187826248afcbbad5a4596adf92570866b20496f49a0612655d6181f08ed85830fd484301dbafd0a2c

Download Submit
C:\Users\Admin\AppData\Local\84tnjh4449\host\hostname

Filesize
64B

MD5
7514b7a3b8eac38d6c4664103dc875d5

SHA1
94859dfa1e01440f90baec88ddde2ebde5ce63d4

SHA256
e469456cc411cb2a844d469824f4a91a0f8730b98b8f458bb5ae559bd78679a8

SHA512
780dab12c973d9445aa6e5d3e2315ef72ced9f98fa5b89517b72a82d575d5b6f15005e3a318b91f11ff09dffc098c8003b56c7866a19cfbda05760d0e7f0a78c

Download Submit
C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\84tnjh4449\torrc.txt

Filesize
218B

MD5
0a19f7d35d052f6b0b06e1bfc4bd43f5

SHA1
f76cd369e24fd2faabeffcc3a05e19e961f4d07e

SHA256
da69ff6a1173f0052924f0fdb3a81cadb2e48eb77778560a190126bcf016c9a2

SHA512
51dc40829ee030ef118103b24b42bd8717bf7a8018a18e5aa448084ad6d9e5f5cafef217adfa22bf9d04aa01d5c13fb26a37d6206b351b998b96bc97de2fdd96

Download Submit
C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe

Filesize
119KB

MD5
369204590ce91e77109e21a298753522

SHA1
e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

SHA256
a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

SHA512
bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

Download Submit
C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe

Filesize
119KB

MD5
369204590ce91e77109e21a298753522

SHA1
e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

SHA256
a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

SHA512
bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\369204590CE91E77109E21A298753522.exe.log

Filesize
847B

MD5
3308a84a40841fab7dfec198b3c31af7

SHA1
4e7ab6336c0538be5dd7da529c0265b3b6523083

SHA256
169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

SHA512
97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB1FA.tmp

Filesize
13.3MB

MD5
89d2d5811c1aff539bb355f15f3ddad0

SHA1
5bb3577c25b6d323d927200c48cd184a3e27c873

SHA256
b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

SHA512
39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

Download Submit
memory/2004-0-0x000002379E9B0000-0x000002379E9D4000-memory.dmp

Filesize
144KB

Download
memory/2004-6-0x00007FFDAF6D0000-0x00007FFDB0191000-memory.dmp

Filesize
10.8MB

Download
memory/2004-3-0x00007FFDAF6D0000-0x00007FFDB0191000-memory.dmp

Filesize
10.8MB

Download
memory/2004-4-0x00000237B8FE0000-0x00000237B8FF0000-memory.dmp

Filesize
64KB

Download
memory/3452-12-0x00000253D4420000-0x00000253D4430000-memory.dmp

Filesize
64KB

Download
memory/3452-11-0x00007FFDAEB40000-0x00007FFDAF601000-memory.dmp

Filesize
10.8MB

Download
memory/3452-59-0x00007FFDAEB40000-0x00007FFDAF601000-memory.dmp

Filesize
10.8MB

Download
memory/3452-69-0x00000253D4420000-0x00000253D4430000-memory.dmp

Filesize
64KB

Download