c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f

Analysis

max time kernel
186s
max time network
30s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
23-11-2022 10:52

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General

Target

c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
Size

447KB
MD5

5e172b6e2d2148aac432a84427e317fc
SHA1

38a53be036765086ba0b25a22baa9d9af567138d
SHA256

c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f
SHA512

61150e2a37df348c0f2289bf6798487128c34f203bab52af6e5964f1c5d515ad8b6d2bf334b836900b30a0cd74df86902d37b4876f4c45bbdff8ed2fdb0513e2
SSDEEP

12288:8OWoOvaY/MF6ZgS4w9Wr0FswrASKn0dV7fPv:8OlEaME6Zg8+0FJw0dVDPv

Score

8^/10

discovery

Malware Config

Signatures

Drops file in Drivers directory 1 IoCs

Processes:

c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe

description ioc process

File created C:\Windows\system32\drivers\nethfdrv.sys c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
Executes dropped EXE 3 IoCs

Processes:

installd.exenethtsrv.exenetupdsrv.exe

pid process

1132 installd.exe
1664 nethtsrv.exe
1820 netupdsrv.exe

description	ioc	process
File created	C:\Windows\system32\drivers\nethfdrv.sys	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe

pid	process
1132	installd.exe
1664	nethtsrv.exe
1820	netupdsrv.exe

Loads dropped DLL 9 IoCs

Processes:

c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exeinstalld.exenethtsrv.exe

pid	process
1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
1132	installd.exe
1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
1664	nethtsrv.exe
1664	nethtsrv.exe
1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.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

Drops file in System32 directory 5 IoCs

Processes:

c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe

description	ioc	process
File created	C:\Windows\SysWOW64\hfnapi.dll	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
File created	C:\Windows\SysWOW64\hfpapi.dll	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
File created	C:\Windows\SysWOW64\installd.exe	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
File created	C:\Windows\SysWOW64\nethtsrv.exe	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
File created	C:\Windows\SysWOW64\netupdsrv.exe	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe

Drops file in Program Files directory 3 IoCs

Processes:

c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe

description	ioc	process
File created	C:\Program Files (x86)\Common Files\Config\ver.xml	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
File created	C:\Program Files (x86)\Common Files\config\uninstinethnfd.exe	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
File created	C:\Program Files (x86)\Common Files\Config\data.xml	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe

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

System Information Discovery
T1082
Runs net.exe
Suspicious behavior: LoadsDriver 1 IoCs

Processes:

pid process

464

pid	process
464

Suspicious use of WriteProcessMemory 34 IoCs

Processes:

c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exenet.exenet.exe

description	pid	process	target process
PID 1368 wrote to memory of 1668	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	net.exe
PID 1368 wrote to memory of 1668	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	net.exe
PID 1368 wrote to memory of 1668	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	net.exe
PID 1368 wrote to memory of 1668	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	net.exe
PID 1668 wrote to memory of 288	1668	net.exe	net1.exe
PID 1668 wrote to memory of 288	1668	net.exe	net1.exe
PID 1668 wrote to memory of 288	1668	net.exe	net1.exe
PID 1668 wrote to memory of 288	1668	net.exe	net1.exe
PID 1368 wrote to memory of 1508	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	net.exe
PID 1368 wrote to memory of 1508	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	net.exe
PID 1368 wrote to memory of 1508	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	net.exe
PID 1368 wrote to memory of 1508	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	net.exe
PID 1508 wrote to memory of 268	1508	net.exe	net1.exe
PID 1508 wrote to memory of 268	1508	net.exe	net1.exe
PID 1508 wrote to memory of 268	1508	net.exe	net1.exe
PID 1508 wrote to memory of 268	1508	net.exe	net1.exe
PID 1368 wrote to memory of 1132	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	installd.exe
PID 1368 wrote to memory of 1132	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	installd.exe
PID 1368 wrote to memory of 1132	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	installd.exe
PID 1368 wrote to memory of 1132	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	installd.exe
PID 1368 wrote to memory of 1132	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	installd.exe
PID 1368 wrote to memory of 1132	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	installd.exe
PID 1368 wrote to memory of 1132	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	installd.exe
PID 1368 wrote to memory of 1664	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	nethtsrv.exe
PID 1368 wrote to memory of 1664	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	nethtsrv.exe
PID 1368 wrote to memory of 1664	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	nethtsrv.exe
PID 1368 wrote to memory of 1664	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	nethtsrv.exe
PID 1368 wrote to memory of 1820	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	netupdsrv.exe
PID 1368 wrote to memory of 1820	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	netupdsrv.exe
PID 1368 wrote to memory of 1820	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	netupdsrv.exe
PID 1368 wrote to memory of 1820	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	netupdsrv.exe
PID 1368 wrote to memory of 1820	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	netupdsrv.exe
PID 1368 wrote to memory of 1820	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	netupdsrv.exe
PID 1368 wrote to memory of 1820	1368	c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe	netupdsrv.exe

C:\Users\Admin\AppData\Local\Temp\c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe
"C:\Users\Admin\AppData\Local\Temp\c99c58d410a55381d8748335b69c7573ea127d13a450043b1d79b7cb6417956f.exe"
1⤵
- Drops file in Drivers directory
- Loads dropped DLL
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:1368

C:\Windows\SysWOW64\net.exe
net stop nethttpservice
2⤵
- Suspicious use of WriteProcessMemory
PID:1668

C:\Windows\SysWOW64\net1.exe
C:\Windows\system32\net1 stop nethttpservice
3⤵
PID:288

C:\Windows\SysWOW64\net.exe
net stop serviceupdater
2⤵
- Suspicious use of WriteProcessMemory
PID:1508

C:\Windows\SysWOW64\net1.exe
C:\Windows\system32\net1 stop serviceupdater
3⤵
PID:268

C:\Windows\SysWOW64\installd.exe
"C:\Windows\system32\installd.exe" nethfdrv
2⤵
- Executes dropped EXE
- Loads dropped DLL
PID:1132

C:\Windows\SysWOW64\nethtsrv.exe
"C:\Windows\system32\nethtsrv.exe" -nfdi
2⤵
- Executes dropped EXE
- Loads dropped DLL
PID:1664

C:\Windows\SysWOW64\netupdsrv.exe
"C:\Windows\system32\netupdsrv.exe" -nfdi
2⤵
- Executes dropped EXE
PID:1820

Network

MITRE ATT&CK Enterprise v6

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:\Windows\SysWOW64\hfnapi.dll

Filesize
106KB

MD5
936ee022e1c64c19af4ac9a652eca06e

SHA1
1913e90e60605a10aca2a723c02ad18b424c8466

SHA256
17aafd28915e80fae66d50931955da96a912043c2598d45cdef1013a88d07c95

SHA512
dbdfca907be39a91002269564edd666fc5cf1623596556928ad9dde212bf3f42cd79e788ba85e46d204b9c26169ed5fa72b67fd511265ab1a82dce4a7ca777b4

Download Submit
C:\Windows\SysWOW64\hfpapi.dll

Filesize
244KB

MD5
47fe225954912a55492a7bba3ff9257c

SHA1
8c97aa67f359894d6893cf9a83593edddee79847

SHA256
7dc86ccdf41d7acdb1837d8db52cef61c8e6b2955d125367af6f3334cdd43a1a

SHA512
693e123fd86a719ab87e6d62c8a0a6ac95923d71da38bb2096c5d7c5b98f7bbfa6f29ac392167c1a236ae0933cc75e4852e66e5a6be46308e8826daf9d6b4a15

Download Submit
C:\Windows\SysWOW64\installd.exe

Filesize
108KB

MD5
f40bfd39a19c8ce8c139c1989f85b4bc

SHA1
1d9d56e7eaa3fe14c88e89b9d7fe42c7cf738ebd

SHA256
42b011e534397979617937edbd7343c4cb22f872b1039c3835b145d3c5233cc0

SHA512
f4d0632644f76beef15ac5d55eb8c71b426e4ad9ef74abd60c279d51758167d74f4c948cb615c4b51eecc2d86c6ba81b7dfb601a65ec087c38861cface878f3c

Download Submit
C:\Windows\SysWOW64\nethtsrv.exe

Filesize
176KB

MD5
02093d4d13c542f3bf1b1d03a9933201

SHA1
0dd3ebf31fb1225b0d8c5d6ba44577db9aa9544d

SHA256
d2e008e202bcb4066fb11a8180b6dec6ea99d28d7a1a3c26c047e9170c5e7dcd

SHA512
06619410dcaa24636208318442cd40993586e64aebeb6648708839b5a00c29a49b043110d1311ca709113377b5a3bfbaddf83b1114f633a2ef6c9131d034b140

Download Submit
C:\Windows\SysWOW64\netupdsrv.exe

Filesize
158KB

MD5
44848e6cc26b16d66a657702214cfb73

SHA1
9f649bf18db887abd7e948f219668eb5031a79b2

SHA256
f72fceae5e6cc4840c6a2929d764f9c6384c763408489a5516dc953e893dcae7

SHA512
d761c939ce7fa9402416fcd129a71a08d3ac7a309ea7d66f599c06bc4e1c0a796fb689df0a1a156ab49194a7b37a2b8ed0ee4187e705956ae02773e05a036097

Download Submit
\Users\Admin\AppData\Local\Temp\nsu7D8C.tmp\System.dll

Filesize
11KB

MD5
c17103ae9072a06da581dec998343fc1

SHA1
b72148c6bdfaada8b8c3f950e610ee7cf1da1f8d

SHA256
dc58d8ad81cacb0c1ed72e33bff8f23ea40b5252b5bb55d393a0903e6819ae2f

SHA512
d32a71aaef18e993f28096d536e41c4d016850721b31171513ce28bbd805a54fd290b7c3e9d935f72e676a1acfb4f0dcc89d95040a0dd29f2b6975855c18986f

Download Submit
\Users\Admin\AppData\Local\Temp\nsu7D8C.tmp\nsExec.dll

Filesize
6KB

MD5
acc2b699edfea5bf5aae45aba3a41e96

SHA1
d2accf4d494e43ceb2cff69abe4dd17147d29cc2

SHA256
168a974eaa3f588d759db3f47c1a9fdc3494ba1fa1a73a84e5e3b2a4d58abd7e

SHA512
e29ea10ada98c71a18273b04f44f385b120d4e8473e441ce5748cfa44a23648814f2656f429b85440157988c88de776c6ac008dc38bf09cbb746c230a46c69fe

Download Submit
\Users\Admin\AppData\Local\Temp\nsu7D8C.tmp\nsExec.dll

Filesize
6KB

MD5
acc2b699edfea5bf5aae45aba3a41e96

SHA1
d2accf4d494e43ceb2cff69abe4dd17147d29cc2

SHA256
168a974eaa3f588d759db3f47c1a9fdc3494ba1fa1a73a84e5e3b2a4d58abd7e

SHA512
e29ea10ada98c71a18273b04f44f385b120d4e8473e441ce5748cfa44a23648814f2656f429b85440157988c88de776c6ac008dc38bf09cbb746c230a46c69fe

Download Submit
\Windows\SysWOW64\hfnapi.dll

Filesize
106KB

MD5
936ee022e1c64c19af4ac9a652eca06e

SHA1
1913e90e60605a10aca2a723c02ad18b424c8466

SHA256
17aafd28915e80fae66d50931955da96a912043c2598d45cdef1013a88d07c95

SHA512
dbdfca907be39a91002269564edd666fc5cf1623596556928ad9dde212bf3f42cd79e788ba85e46d204b9c26169ed5fa72b67fd511265ab1a82dce4a7ca777b4

Download Submit
\Windows\SysWOW64\hfnapi.dll

Filesize
106KB

MD5
936ee022e1c64c19af4ac9a652eca06e

SHA1
1913e90e60605a10aca2a723c02ad18b424c8466

SHA256
17aafd28915e80fae66d50931955da96a912043c2598d45cdef1013a88d07c95

SHA512
dbdfca907be39a91002269564edd666fc5cf1623596556928ad9dde212bf3f42cd79e788ba85e46d204b9c26169ed5fa72b67fd511265ab1a82dce4a7ca777b4

Download Submit
\Windows\SysWOW64\hfpapi.dll

Filesize
244KB

MD5
47fe225954912a55492a7bba3ff9257c

SHA1
8c97aa67f359894d6893cf9a83593edddee79847

SHA256
7dc86ccdf41d7acdb1837d8db52cef61c8e6b2955d125367af6f3334cdd43a1a

SHA512
693e123fd86a719ab87e6d62c8a0a6ac95923d71da38bb2096c5d7c5b98f7bbfa6f29ac392167c1a236ae0933cc75e4852e66e5a6be46308e8826daf9d6b4a15

Download Submit
\Windows\SysWOW64\installd.exe

Filesize
108KB

MD5
f40bfd39a19c8ce8c139c1989f85b4bc

SHA1
1d9d56e7eaa3fe14c88e89b9d7fe42c7cf738ebd

SHA256
42b011e534397979617937edbd7343c4cb22f872b1039c3835b145d3c5233cc0

SHA512
f4d0632644f76beef15ac5d55eb8c71b426e4ad9ef74abd60c279d51758167d74f4c948cb615c4b51eecc2d86c6ba81b7dfb601a65ec087c38861cface878f3c

Download Submit
\Windows\SysWOW64\nethtsrv.exe

Filesize
176KB

MD5
02093d4d13c542f3bf1b1d03a9933201

SHA1
0dd3ebf31fb1225b0d8c5d6ba44577db9aa9544d

SHA256
d2e008e202bcb4066fb11a8180b6dec6ea99d28d7a1a3c26c047e9170c5e7dcd

SHA512
06619410dcaa24636208318442cd40993586e64aebeb6648708839b5a00c29a49b043110d1311ca709113377b5a3bfbaddf83b1114f633a2ef6c9131d034b140

Download Submit
\Windows\SysWOW64\netupdsrv.exe

Filesize
158KB

MD5
44848e6cc26b16d66a657702214cfb73

SHA1
9f649bf18db887abd7e948f219668eb5031a79b2

SHA256
f72fceae5e6cc4840c6a2929d764f9c6384c763408489a5516dc953e893dcae7

SHA512
d761c939ce7fa9402416fcd129a71a08d3ac7a309ea7d66f599c06bc4e1c0a796fb689df0a1a156ab49194a7b37a2b8ed0ee4187e705956ae02773e05a036097

Download Submit
memory/268-61-0x0000000000000000-mapping.dmp

Download
memory/288-58-0x0000000000000000-mapping.dmp

Download
memory/1132-63-0x0000000000000000-mapping.dmp

Download
memory/1368-54-0x0000000074DA1000-0x0000000074DA3000-memory.dmp

Filesize
8KB

Download
memory/1508-60-0x0000000000000000-mapping.dmp

Download
memory/1664-69-0x0000000000000000-mapping.dmp

Download
memory/1668-57-0x0000000000000000-mapping.dmp

Download
memory/1820-75-0x0000000000000000-mapping.dmp

Download